diff --git a/lib/cake.js b/lib/cake.js
index 9fb7fa10..2fbf2d88 100755
--- a/lib/cake.js
+++ b/lib/cake.js
@@ -37,7 +37,7 @@
     return path.exists('Cakefile', function(exists) {
       var _a, _b, _c, _d, arg, args;
       if (!(exists)) {
-        throw new Error(("Cakefile not found in " + (process.cwd())));
+        throw new Error("Cakefile not found in " + (process.cwd()));
       }
       args = process.argv.slice(2, process.argv.length);
       CoffeeScript.run(fs.readFileSync('Cakefile').toString(), {
@@ -71,14 +71,14 @@
         return _b;
       })().join('') : '';
       desc = task.description ? ("# " + (task.description)) : '';
-      puts(("cake " + (name) + (spaces) + " " + (desc)));
+      puts("cake " + (name) + (spaces) + " " + (desc));
     }
     if (switches.length) {
       return puts(oparse.help());
     }
   };
   missingTask = function(task) {
-    puts(("No such task: \"" + (task) + "\""));
+    puts("No such task: \"" + (task) + "\"");
     return process.exit(1);
   };
 })();
diff --git a/lib/command.js b/lib/command.js
index df7311ca..c646c36c 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -64,7 +64,7 @@
           compile = function(source, topLevel) {
             return path.exists(source, function(exists) {
               if (!(exists)) {
-                throw new Error(("File not found: " + (source)));
+                throw new Error("File not found: " + (source));
               }
               return fs.stat(source, function(err, stats) {
                 if (stats.isDirectory()) {
@@ -179,12 +179,12 @@
       }
       return fs.writeFile(jsPath, js, function(err) {
         if (options.compile && options.watch) {
-          return puts(("Compiled " + (source)));
+          return puts("Compiled " + (source));
         }
       });
     };
     return path.exists(dir, function(exists) {
-      return exists ? compile() : exec(("mkdir -p " + (dir)), compile);
+      return exists ? compile() : exec("mkdir -p " + (dir), compile);
     });
   };
   lint = function(js) {
@@ -238,7 +238,7 @@
     return process.exit(0);
   };
   version = function() {
-    puts(("CoffeeScript version " + (CoffeeScript.VERSION)));
+    puts("CoffeeScript version " + (CoffeeScript.VERSION));
     return process.exit(0);
   };
 })();
diff --git a/lib/grammar.js b/lib/grammar.js
index e7fde415..516aa549 100644
--- a/lib/grammar.js
+++ b/lib/grammar.js
@@ -539,13 +539,13 @@
     Operation: [
       o("UNARY Expression", function() {
         return new OpNode($1, $2);
-      }), o("- Expression", (function() {
+      }), o("- Expression", function() {
         return new OpNode('-', $2);
-      }), {
+      }, {
         prec: 'UNARY'
-      }), o("+ Expression", (function() {
+      }), o("+ Expression", function() {
         return new OpNode('+', $2);
-      }), {
+      }, {
         prec: 'UNARY'
       }), o("-- Expression", function() {
         return new OpNode('--', $2);
diff --git a/lib/helpers.js b/lib/helpers.js
index 4a1b9da6..20c44842 100644
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -1,6 +1,6 @@
 (function() {
   var compact, count, del, ends, extend, flatten, helpers, include, indexOf, merge, starts;
-  if (!((typeof process !== "undefined" && process !== null))) {
+  if (!(typeof process !== "undefined" && process !== null)) {
     this.exports = this;
   }
   helpers = (exports.helpers = {});
@@ -72,7 +72,7 @@
     _a = []; _b = properties;
     for (key in _b) {
       val = _b[key];
-      _a.push((object[key] = val));
+      _a.push(object[key] = val);
     }
     return _a;
   });
diff --git a/lib/lexer.js b/lib/lexer.js
index 499d0703..034b4e19 100644
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -216,7 +216,7 @@
           return '\\' + escaped;
         });
         this.tokens = this.tokens.concat([['(', '('], ['NEW', 'new'], ['IDENTIFIER', 'RegExp'], ['CALL_START', '(']]);
-        this.interpolateString(("\"" + (str) + "\""), {
+        this.interpolateString("\"" + (str) + "\"", {
           escapeQuotes: true
         });
         if (flags) {
@@ -400,7 +400,7 @@
       if (options.herecomment) {
         return doc;
       }
-      return doc.replace(MULTILINER, "\\n").replace(new RegExp(options.quote, 'g'), ("\\" + (options.quote)));
+      return doc.replace(MULTILINER, "\\n").replace(new RegExp(options.quote, 'g'), "\\" + (options.quote));
     };
     Lexer.prototype.tagParameters = function() {
       var _d, i, tok;
@@ -428,10 +428,10 @@
       return this.outdentToken(this.indent);
     };
     Lexer.prototype.identifierError = function(word) {
-      throw new Error(("SyntaxError: Reserved word \"" + (word) + "\" on line " + (this.line + 1)));
+      throw new Error("SyntaxError: Reserved word \"" + (word) + "\" on line " + (this.line + 1));
     };
     Lexer.prototype.assignmentError = function() {
-      throw new Error(("SyntaxError: Reserved word \"" + (this.value()) + "\" on line " + (this.line + 1) + " can't be assigned"));
+      throw new Error("SyntaxError: Reserved word \"" + (this.value()) + "\" on line " + (this.line + 1) + " can't be assigned");
     };
     Lexer.prototype.balancedString = function(str, delimited, options) {
       var _d, _e, _f, _g, close, i, levels, open, pair, slash;
@@ -472,7 +472,7 @@
         if (slash) {
           return false;
         }
-        throw new Error(("SyntaxError: Unterminated " + (levels.pop()[0]) + " starting on line " + (this.line + 1)));
+        throw new Error("SyntaxError: Unterminated " + (levels.pop()[0]) + " starting on line " + (this.line + 1));
       }
       return !i ? false : str.substring(0, i);
     };
@@ -500,7 +500,7 @@
               if (options.heredoc) {
                 inner = inner.replace(new RegExp('\\\\' + quote, 'g'), quote);
               }
-              nested = lexer.tokenize(("(" + (inner) + ")"), {
+              nested = lexer.tokenize("(" + (inner) + ")", {
                 line: this.line
               });
               _e = nested;
@@ -540,7 +540,7 @@
             this.tokens = this.tokens.concat(value);
           } else if (tag === 'STRING' && options.escapeQuotes) {
             escaped = value.substring(1, value.length - 1).replace(/"/g, '\\"');
-            this.token(tag, ("\"" + (escaped) + "\""));
+            this.token(tag, "\"" + (escaped) + "\"");
           } else {
             this.token(tag, value);
           }
diff --git a/lib/nodes.js b/lib/nodes.js
index d9dedf01..0f108abe 100644
--- a/lib/nodes.js
+++ b/lib/nodes.js
@@ -383,6 +383,9 @@
       op = del(o, 'operation');
       props = only ? this.properties.slice(0, this.properties.length - 1) : this.properties;
       o.chainRoot = o.chainRoot || this;
+      if (this.parenthetical && !props.length) {
+        this.base.parenthetical = true;
+      }
       baseline = this.base.compile(o);
       if (this.hasProperties() && (this.base instanceof ObjectNode || this.isNumber())) {
         baseline = ("(" + (baseline) + ")");
@@ -483,18 +486,21 @@
           compilation = this.compileSplat(o);
         }
       }
-      if (!(compilation)) {
+      if (!compilation) {
         args = (function() {
           _e = []; _g = this.args;
           for (_f = 0, _h = _g.length; _f < _h; _f++) {
             arg = _g[_f];
-            _e.push(arg.compile(o));
+            _e.push((function() {
+              arg.parenthetical = true;
+              return arg.compile(o);
+            })());
           }
           return _e;
-        }).call(this).join(', ');
-        compilation = this.isSuper ? this.compileSuper(args, o) : ("" + (this.prefix()) + (this.variable.compile(o)) + "(" + (args) + ")");
+        }).call(this);
+        compilation = this.isSuper ? this.compileSuper(args.join(', '), o) : ("" + (this.prefix()) + (this.variable.compile(o)) + "(" + (args.join(', ')) + ")");
       }
-      return o.operation && this.wrapped ? ("(" + (compilation) + ")") : compilation;
+      return compilation;
     };
     CallNode.prototype.compileSuper = function(args, o) {
       return "" + (this.superReference(o)) + ".call(this" + (args.length ? ', ' : '') + (args) + ")";
@@ -759,11 +765,11 @@
         if (obj instanceof SplatNode) {
           return this.compileSplatLiteral(o);
         } else if (obj instanceof CommentNode) {
-          objects.push(("\n" + (code) + "\n" + (o.indent)));
+          objects.push("\n" + (code) + "\n" + (o.indent));
         } else if (i === this.objects.length - 1) {
           objects.push(code);
         } else {
-          objects.push(("" + (code) + ", "));
+          objects.push("" + (code) + ", ");
         }
       }
       objects = objects.join('');
@@ -832,7 +838,7 @@
           if (constructor.body.empty()) {
             constructor.body.push(new ReturnNode(literal('this')));
           }
-          constructor.body.unshift(literal(("this." + (pname) + " = function(){ return " + (className) + ".prototype." + (pname) + ".apply(" + (me) + ", arguments); }")));
+          constructor.body.unshift(literal("this." + (pname) + " = function(){ return " + (className) + ".prototype." + (pname) + ".apply(" + (me) + ", arguments); }"));
         }
         if (pvar) {
           access = prop.context === 'this' ? pvar.base.properties[0] : new AccessorNode(pvar, 'prototype');
@@ -842,7 +848,7 @@
         props.push(prop);
       }
       if (me) {
-        constructor.body.unshift(literal(("" + (me) + " = this")));
+        constructor.body.unshift(literal("" + (me) + " = this"));
       }
       construct = this.idt() + (new AssignNode(this.variable, constructor)).compile(merge(o, {
         sharedScope: constScope
@@ -915,7 +921,7 @@
       if (stmt) {
         return ("" + (this.tab) + (val) + ";");
       }
-      return top ? val : ("(" + (val) + ")");
+      return top || this.parenthetical ? val : ("(" + (val) + ")");
     };
     AssignNode.prototype.compilePatternMatch = function(o) {
       var _b, _c, _d, accessClass, assigns, code, i, idx, isString, obj, oindex, olength, splat, val, valVar, value;
@@ -944,7 +950,7 @@
         isString = idx.value && idx.value.match(IS_STRING);
         accessClass = isString || this.variable.isArray() ? IndexNode : AccessorNode;
         if (obj instanceof SplatNode && !splat) {
-          val = literal(obj.compileValue(o, valVar, (oindex = indexOf(this.variable.base.objects, obj)), (olength = this.variable.base.objects.length) - oindex - 1));
+          val = literal(obj.compileValue(o, valVar, oindex = indexOf(this.variable.base.objects, obj), (olength = this.variable.base.objects.length) - oindex - 1));
           splat = true;
         } else {
           if (typeof idx !== 'object') {
@@ -1125,7 +1131,7 @@
             assign.value = trailing;
           }
           pos = this.trailings.length - idx;
-          o.scope.assign(trailing.compile(o), ("arguments[" + (variadic) + " ? " + (len) + " - " + (pos) + " : " + (this.index + idx) + "]"));
+          o.scope.assign(trailing.compile(o), "arguments[" + (variadic) + " ? " + (len) + " - " + (pos) + " : " + (this.index + idx) + "]");
         }
       }
       return "" + (name) + " = " + (utility('slice')) + ".call(arguments, " + (this.index) + (end) + ")";
@@ -1354,7 +1360,7 @@
         _b = []; _c = this.array.base.objects;
         for (i = 0, _d = _c.length; i < _d; i++) {
           item = _c[i];
-          _b.push(("" + (item.compile(o)) + " === " + (i ? this.obj2 : this.obj1)));
+          _b.push("" + (item.compile(o)) + " === " + (i ? this.obj2 : this.obj1));
         }
         return _b;
       }).call(this);
@@ -1438,7 +1444,9 @@
     ExistenceNode.prototype["class"] = 'ExistenceNode';
     ExistenceNode.prototype.children = ['expression'];
     ExistenceNode.prototype.compileNode = function(o) {
-      return ExistenceNode.compileTest(o, this.expression)[0];
+      var test;
+      test = ExistenceNode.compileTest(o, this.expression)[0];
+      return this.parenthetical ? test.substring(1, test.length - 1) : test;
     };
     ExistenceNode.compileTest = function(o, variable) {
       var _b, first, second;
@@ -1469,17 +1477,14 @@
       return true;
     };
     ParentheticalNode.prototype.compileNode = function(o) {
-      var code, l, top;
+      var code, top;
       top = del(o, 'top');
+      this.expression.parenthetical = true;
       code = this.expression.compile(o);
-      if (this.isStatement(o)) {
-        return (top ? this.tab + code + ';' : code);
+      if (this.parenthetical || this.isStatement(o)) {
+        return top ? this.tab + code + ';' : code;
       }
-      l = code.length;
-      if (code.substr(l - 1, 1) === ';') {
-        code = code.substr(o, l - 1);
-      }
-      return this.expression instanceof AssignNode ? code : ("(" + (code) + ")");
+      return "(" + (code) + ")";
     };
     return ParentheticalNode;
   })();
@@ -1571,7 +1576,7 @@
         svar = scope.freeVariable();
         sourcePart = ("" + (svar) + " = " + (this.source.compile(o)) + ";");
         if (this.pattern) {
-          namePart = new AssignNode(this.name, literal(("" + (svar) + "[" + (ivar) + "]"))).compile(merge(o, {
+          namePart = new AssignNode(this.name, literal("" + (svar) + "[" + (ivar) + "]")).compile(merge(o, {
             indent: this.idt(1),
             top: true
           })) + '\n';
@@ -1597,13 +1602,13 @@
       }
       if (codeInBody) {
         if (range) {
-          body.unshift(literal(("var " + (name) + " = " + (ivar))));
+          body.unshift(literal("var " + (name) + " = " + (ivar)));
         }
         if (namePart) {
-          body.unshift(literal(("var " + (namePart))));
+          body.unshift(literal("var " + (namePart)));
         }
         if (index) {
-          body.unshift(literal(("var " + (index) + " = " + (ivar))));
+          body.unshift(literal("var " + (index) + " = " + (ivar)));
         }
         body = ClosureNode.wrap(body, true);
       } else {
@@ -1660,7 +1665,7 @@
     IfNode.prototype.rewriteSwitch = function(o) {
       var _b, _c, _d, cond, i, variable;
       this.assigner = this.switchSubject;
-      if (!((this.switchSubject.unwrap() instanceof LiteralNode))) {
+      if (!(this.switchSubject.unwrap() instanceof LiteralNode)) {
         variable = literal(o.scope.freeVariable());
         this.assigner = new AssignNode(variable, this.switchSubject);
         this.switchSubject = variable;
@@ -1673,7 +1678,7 @@
             if (cond instanceof OpNode) {
               cond = new ParentheticalNode(cond);
             }
-            return new OpNode('==', (i === 0 ? this.assigner : this.switchSubject), cond);
+            return new OpNode('==', i === 0 ? this.assigner : this.switchSubject, cond);
           }).call(this));
         }
         return _b;
diff --git a/lib/optparse.js b/lib/optparse.js
index 138b9a19..8e640c86 100755
--- a/lib/optparse.js
+++ b/lib/optparse.js
@@ -28,7 +28,7 @@
           }
         }
         if (isOption && !matchedRule) {
-          throw new Error(("unrecognized option: " + (arg)));
+          throw new Error("unrecognized option: " + (arg));
         }
         if (!isOption) {
           options.arguments = args.slice(i, args.length);
@@ -41,7 +41,7 @@
       var _a, _b, _c, _d, i, letPart, lines, rule, spaces;
       lines = ['Available options:'];
       if (this.banner) {
-        lines.unshift(("" + (this.banner) + "\n"));
+        lines.unshift("" + (this.banner) + "\n");
       }
       _b = this.rules;
       for (_a = 0, _c = _b.length; _a < _c; _a++) {
diff --git a/lib/rewriter.js b/lib/rewriter.js
index c228c82a..15dfa10c 100644
--- a/lib/rewriter.js
+++ b/lib/rewriter.js
@@ -275,7 +275,7 @@
             levels[open] -= 1;
           }
           if (levels[open] < 0) {
-            throw new Error(("too many " + (token[1]) + " on line " + (token[2] + 1)));
+            throw new Error("too many " + (token[1]) + " on line " + (token[2] + 1));
           }
         }
         return 1;
@@ -294,7 +294,7 @@
       if (unclosed.length) {
         open = unclosed[0];
         line = openLine[open] + 1;
-        throw new Error(("unclosed " + (open) + " on line " + (line)));
+        throw new Error("unclosed " + (open) + " on line " + (line));
       }
     };
     Rewriter.prototype.rewriteClosingParens = function() {
diff --git a/lib/scope.js b/lib/scope.js
index 0e13ca3b..6fce7a65 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -1,7 +1,7 @@
 (function() {
   var Scope;
   var __hasProp = Object.prototype.hasOwnProperty;
-  if (!((typeof process !== "undefined" && process !== null))) {
+  if (!(typeof process !== "undefined" && process !== null)) {
     this.exports = this;
   }
   exports.Scope = (function() {
@@ -95,7 +95,7 @@
         if (!__hasProp.call(_b, key)) continue;
         val = _b[key];
         if (val.assigned) {
-          _a.push(("" + (key) + " = " + (val.value)));
+          _a.push("" + (key) + " = " + (val.value));
         }
       }
       return _a;
diff --git a/src/nodes.coffee b/src/nodes.coffee
index c252ce91..e3abf783 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -354,6 +354,7 @@ exports.ValueNode = class ValueNode extends BaseNode
     op          = del o, 'operation'
     props       = if only then @properties[0...@properties.length - 1] else @properties
     o.chainRoot or= this
+    @base.parenthetical = yes if @parenthetical and not props.length
     baseline    = @base.compile o
     baseline    = "(#{baseline})" if @hasProperties() and (@base instanceof ObjectNode or @isNumber())
     complete    = @last = baseline
@@ -434,11 +435,15 @@ exports.CallNode = class CallNode extends BaseNode
     o.chainRoot = this unless o.chainRoot
     for arg in @args when arg instanceof SplatNode
       compilation = @compileSplat(o)
-    unless compilation
-      args = (arg.compile(o) for arg in @args).join(', ')
-      compilation = if @isSuper then @compileSuper(args, o)
-      else "#{@prefix()}#{@variable.compile(o)}(#{args})"
-    if o.operation and @wrapped then "(#{compilation})" else compilation
+    if not compilation
+      args = for arg in @args
+        arg.parenthetical = true
+        arg.compile o
+      compilation = if @isSuper
+        @compileSuper(args.join(', '), o)
+      else
+        "#{@prefix()}#{@variable.compile(o)}(#{ args.join(', ') })"
+    compilation
 
   # `super()` is converted into a call against the superclass's implementation
   # of the current function.
@@ -790,7 +795,7 @@ exports.AssignNode = class AssignNode extends BaseNode
     o.scope.find name unless @isValue() and (@variable.hasProperties() or @variable.namespaced)
     val = "#{name} = #{val}"
     return "#{@tab}#{val};" if stmt
-    if top then val else "(#{val})"
+    if top or @parenthetical then val else "(#{val})"
 
   # Brief implementation of recursive pattern matching, when assigning array or
   # object literals to a value. Peeks at their properties to assign inner names.
@@ -1214,7 +1219,8 @@ exports.ExistenceNode = class ExistenceNode extends BaseNode
   constructor: (@expression) ->
 
   compileNode: (o) ->
-    ExistenceNode.compileTest(o, @expression)[0]
+    test = ExistenceNode.compileTest(o, @expression)[0]
+    if @parenthetical then test.substring(1, test.length - 1) else test
 
   # The meat of the **ExistenceNode** is in this static `compileTest` method
   # because other nodes like to check the existence of their variables as well.
@@ -1248,12 +1254,11 @@ exports.ParentheticalNode = class ParentheticalNode extends BaseNode
 
   compileNode: (o) ->
     top  = del o, 'top'
+    @expression.parenthetical = true
     code = @expression.compile(o)
-    if @isStatement(o)
-      return (if top then @tab + code + ';' else code)
-    l    = code.length
-    code = code.substr(o, l-1) if code.substr(l-1, 1) is ';'
-    if @expression instanceof AssignNode then code else "(#{code})"
+    if @parenthetical or @isStatement o
+      return if top then @tab + code + ';' else code
+    "(#{code})"
 
 #### ForNode