You are to post an answer you posted that exploited a loophole in the challengers question. Bonus points if it caused them to rewrite the question.
For example, one challenge was to write a program that such that if a random character is removed, it still works, and your score is how many characters it fails on. Some one posted the empty program, since then it would fail on no characters (though the compiler would fail) and the question had to be changed. He was unrightly down-voted, so I hope he sees this challenge.
This is a popularity contest, so whoever gets the most votes wins!