A Holiday Card From Us to You
Prove: Happy Holidays!
Note 1: These statements actually are a holiday greeting. If you do not get "it", carefully copy the "given" down on a piece of paper, paying careful attention to detail, perhaps even mouthing each letter out loud.
Note 2: Many people claim this was Alfred Hitchcock's Christmas greeting to François Truffaut. Others claim it was first sent as a Christmas greeting from one mathematician to another...any idea who and to whom? (This is a test of your knowledge of Martin Gardner trivia.)