I've been on a Live365 binge, and I'm very fond of Haunted Mansion Radio, a radio station devoted to Disneyland's Haunted Mansion. I've heard several versions of "Grim Grinning Ghosts" now, and lots of versions of the welcome/exit sounds.

After a dozen iterations, I'm struck by how, over and over again, the ghosts ask you to join them. Of course, that's a fairly obvious running joke, but that would be an interesting story--someone who, over and over again, goes on the haunted house ride until finally s/he/it finds a way to join them. That must have been done.