I like any contest that requires me to comment some out of context story.

I once got onto a battle of wits with a lady who worked at my old college book store. I wanted to sell my books back and she said that I needed a school ID to do it. I disagreed and framed my argument in such a way that she either had to admit that she was being rude for the sake of being rude or buy my book. She did. The moral here is it often pays more to be clever than to get angry.