In a modern occult game I ran a few years ago, Andy Warhol had one inside a camera. The PCs were strongarming him, and managed to break the camera and let the thing out. It wasn't pretty.
(Okay, it was *a* Andy Warhol, not *the* Andy Warhol, but that's another story.)
They weren't exactly sure what it was (although some of the players knew), but based on the description they made the wise move to vacate the building entirely.