diff --git a/example/tweeter/style.css b/example/tweeter/style.css
index 769a6f45..0f2aaecd 100644
--- a/example/tweeter/style.css
+++ b/example/tweeter/style.css
@@ -84,4 +84,11 @@ label {
   
 .editor TEXTAREA {
   height: 50px;
+}
+
+.debug{
+  font-size: .7em;
+  white-space: pre;
+  padding: 0;
+  margin: 0;
 }
\ No newline at end of file
diff --git a/example/tweeter/tweeter_addressbook.html b/example/tweeter/tweeter_addressbook.html
index d8b8b893..70068b0a 100644
--- a/example/tweeter/tweeter_addressbook.html
+++ b/example/tweeter/tweeter_addressbook.html
@@ -39,6 +39,18 @@
           <input type="button" ng-action="$anchor.edituser=undefined" value="Close"/> 
         </div>
       </div>
+      <hr/>
+      <div class="debug">
+userFilter={{userFilter|json}}
+
+tweetFilter={{tweetFilter|json}}
+
+$anchor={{$anchor}}
+
+users={{users}}
+
+tweets={{tweets}}
+      </div>
     </div>
     <div class="tweeter box">
       <h1>Tweets: {{$anchor.user}}</h1>
diff --git a/src/Parser.js b/src/Parser.js
index 333b8413..840f5541 100644
--- a/src/Parser.js
+++ b/src/Parser.js
@@ -294,15 +294,13 @@ Parser.prototype = {
     }
   },
   
-  _unary: function(fn, parse) {
-    var right = parse.apply(this);
+  _unary: function(fn, right) {
     return function(self) {
       return fn(self, right(self));
     };
   },
   
-  _binary: function(left, fn, parse) {
-    var right = parse.apply(this);
+  _binary: function(left, fn, right) {
     return function(self) {
       return fn(self, left(self), right(self));
     };
@@ -343,7 +341,7 @@ Parser.prototype = {
     var token;
     while(true) {
       if ((token = this.expect('|'))) {
-        left = this._binary(left, token.fn, this.filter);
+        left = this._binary(left, token.fn, this.filter());
       } else {
         return left;
       }
@@ -405,7 +403,7 @@ Parser.prototype = {
             this.text.substring(token.index) + "' is not assignable.";
       }
       var ident = function(){return left.isAssignable;};
-      return this._binary(ident, token.fn, this.logicalOR);
+      return this._binary(ident, token.fn, this.logicalOR());
     } else {
      return left;
     }
@@ -416,7 +414,7 @@ Parser.prototype = {
     var token;
     while(true) {
       if ((token = this.expect('||'))) {
-        left = this._binary(left, token.fn, this.logicalAND);
+        left = this._binary(left, token.fn, this.logicalAND());
       } else {
         return left;
       }
@@ -428,7 +426,7 @@ Parser.prototype = {
     var token;
     while(true) {
       if ((token = this.expect('&&'))) {
-        left = this._binary(left, token.fn, this.negated);
+        left = this._binary(left, token.fn, this.negated());
       } else {
         return left;
       }
@@ -438,9 +436,9 @@ Parser.prototype = {
   negated: function(){
     var token;
     if (token = this.expect('!')) {
-      return this._unary(token.fn, this.equality);
+      return this._unary(token.fn, this.assignment());
     } else {
-     return this.equality();
+      return this.equality();
     }
   },
   
@@ -449,7 +447,7 @@ Parser.prototype = {
     var token;
     while(true) {
       if ((token = this.expect('==','!='))) {
-        left = this._binary(left, token.fn, this.relational);
+        left = this._binary(left, token.fn, this.relational());
       } else {
         return left;
       }
@@ -461,7 +459,7 @@ Parser.prototype = {
     var token;
     while(true) {
       if ((token = this.expect('<', '>', '<=', '>='))) {
-        left = this._binary(left, token.fn, this.additive);
+        left = this._binary(left, token.fn, this.additive());
       } else {
         return left;
       }
@@ -472,7 +470,7 @@ Parser.prototype = {
     var left = this.multiplicative();
     var token;
     while(token = this.expect('+','-')) {
-      left = this._binary(left, token.fn, this.multiplicative);
+      left = this._binary(left, token.fn, this.multiplicative());
     }
     return left;
   },
@@ -481,7 +479,7 @@ Parser.prototype = {
     var left = this.unary();
     var token;
     while(token = this.expect('*','/','%')) {
-        left = this._binary(left, token.fn, this.unary);
+        left = this._binary(left, token.fn, this.unary());
     }
     return left;
   },
@@ -491,7 +489,7 @@ Parser.prototype = {
     if (this.expect('+')) {
       return this.primary();
     } else if (token = this.expect('-')) {
-      return this._binary(Parser.ZERO, token.fn, this.multiplicative);
+      return this._binary(Parser.ZERO, token.fn, this.multiplicative());
     } else {
      return this.primary();
     }
diff --git a/test/ParserTest.js b/test/ParserTest.js
index 058010f3..fbd9f508 100644
--- a/test/ParserTest.js
+++ b/test/ParserTest.js
@@ -460,3 +460,11 @@ ParserTest.prototype.testReturnFunctionsAreNotBound = function(){
   assertEquals("direct Group.all", "function", typeof Group.query);
 };
 
+ParserTest.prototype.testDoubleNegationBug = function (){
+  var scope = new Scope();
+  assertEquals(true, scope.eval('true'));
+  assertEquals(false, scope.eval('!true'));
+  assertEquals(true, scope.eval('!!true'));
+  assertEquals('a', scope.eval('{true:"a", false:"b"}[!!true]'));
+};
+