Ghost Key by Funtime (watch video).
The performer displays the Ghost Key - a large key that he invites his audience to examine to their heart's content. When the performer places the key across his hand, and mutters some invocation under his breath, the key turns - slowly and mysteriously, as if haunted, and imbibed with a life of its own. Can also be performed on the spectator's hand. Made of brass, chromium plated and ready to use - any place, any time.
Video Demonstration:
Ghost Key by Funtime (watch video)