Text A spectator screws a nut onto a bolt about half way up and then you hold it at your fingertips. The audience can always see your empty hands. Suddenly the nut starts to rotate and unwind off the bolt and finally drops off the end. It looks like some ghostly power is unscrewing the nut and bolt.
Here are a few considerations.
No complicated body hook ups.
Can be immediately repeated as many times as you want.
Can be fully examined before and after the effect.
No clothing limitation. You can wear short-sleeves. You don't even have to be wearing clothes!
No switches are required.
Audience themselves screw the nut onto the bolt and also you can hand the bolt and nut to them immediately after the effect.
The gimmick is self-contained WITHIN the bolt and nut yet your spectators can freely handle and examine the props.