I've actually seen that before, but done with a $50. Having been a waitress before (although we don't rely on tips here in Aus) I can't tell you how much that makes my blood boil!! Don't want to leave a tip? Don't. But don't trick people - especially if, as helmespc said, they may already share your faith. Way to screw one of your own!
Some people are such dickwads.
Some people are such dickwads.