I stumbled across some javascript syntax that seemed like it should produce a parse error of some kind but doesn\'t:
if (true, true) {console.log(\'splendid
The comma operator evaluates each of its operands (from left to right) and returns the value of the last operand.
https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Operators/Special_Operators/Comma_Operator
https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Expressions_and_Operators#comma_operator