If you've never performed the Haunted Key, you've never witnessed the power it can have on a live audience.
Despite being completely examinable, the Ghost Key will revolve in your hand in a spooky but self-working way.

The magician displays a very old looking skeleton key in his hand. The magician grabs the teeth of the key and starts to revolve the teeth around the shaft. The teeth are slid down to the opposite end and given another spin half way around the shaft. The key is then handed out for inspection. The spectator cannot move the teeth, they have solidified where the magician left