Psychokinetic Lock

A lock and key are both handed out for examination to a member of the audience.  After they have been thoroughly examined and the spectator tries the key, you ask for him to place the lock in a martini glass and keep the key. The martini glass is covered with a cloth and you attempt to move the lock through psycho kinesis. All seems to fail.

When the glass is uncovered, miraculously the lock is seen locked to the stem of the glass.  Not only did you move the object, but you unlocked it and re-locked it with your mind. Martini glass is actual glass, not cheap plastic.