at the Comics Curmudgeon is too funny not to share. It started with a stupid Family Circus comic strip, where little Jeffy apparently thinks his heart is located in his ass. It took a little while to get going, but at about comment #80 people began thinking up song titles, book titles, etc. that contain the word "heart" and substituting "ass". It's rather like the pants game, but more restricted. If you have a few minutes to spare, and nobody around who'll be annoyed by the sound of your laughing, go check it out.
Myself, I quite liked "Your Cheatin' Ass" and "The Ass Is A Lonely Hunter." I think country & western titles would be a gold mine for a game like this.