It's fun to see a rule bypass or two, but almost of those were hacks and not technically very impressive.<p>Kudos to the Whitespace one though, pretty cool.
Coffee-Script: 82<p>(f=(f)->console.log(String.fromCharCode(c)) for c in [20..126] if c !in f)("\\\""+f)<p>Hopefully translation to JS doesn't kill the set of characters used in the source.<p>Javascript: 93<p>(f=function(f){for(u=20;u<127;u++){if(f.indexOf(u)<0)alert(String.fromCharCode(u))}})('\\\''+f)
Just submitted my version. I think I cannot be beaten in numbers of characters... [1]<p>1: <a href="http://codegolf.stackexchange.com/a/19692/1924" rel="nofollow">http://codegolf.stackexchange.com/a/19692/1924</a>