This is crazy!
But YOU can do this one so easily!
Show your spectator a metal bolt and a metal nut.
Screw the nut securely onto the bolt, place them into a metal tube, and put the cover on the tube.
Nothing can escape!
Let your spectator place his hand under the tube, and give the top of the tube a good tap.
The nut falls into his hand!
It has invisibly unscrewed itself from the bolt and traveled right through the solid tube!
Carry this one in your pocket if you want to be ready to impress anytime and anywhere!