Skelevision

The guest would enter a hallway and see themselves in a mirror at the end of the hall. All of a sudden, the lights would go out, spooky sound effects would play and then a skeleton would appear where they previously saw themselves in the mirror. The skeleton would be frantically waving its arms. After a few seconds, the skeleton would disappear and the guest would once again see themselves in the mirror.

Complete instructions included. You’ll also find plans for the Kitchen Sink Coffin, the Grave Stomper, and various moving body parts. Link