Great explanation Gary -- much funnier than the original joke. Reminds me of my (American) Junior High school graduation (Belton, Missouri) when the Prom Queen gave me her book to autograph, and I put in it: Yours Till Niagara Falls. And she looked at it very carefully, and then said: "That's a Canadian joke, right?"

It was a pity, she was so extremely beautiful.

yours, Peter T.