Having spoken to my editors and other people, apparently Ha Ha is not as well known as I thought. All persons playing a game of Ha Ha lie down on the floor, each with their head on the stomach of another player, everyone connected like dominos. The first player says, "Ha." The player on whose stomach his head is resting says, "Ha Ha." Each player adds an additional "Ha" until everybody is rolling on the floor laughing. I don't recall playing a round of Ha Ha that went beyond "Ha Ha Ha Ha" before everyone broke into uncontrollable laughter. Kids enjoy it, but it's a fun time for adults as well.