Ring Flite is a classic trick. However it became popular after the amazing performance by Al Koran, who improved the method greatly.
Effect: The performer borrows a finger ring from a spectator and vanishes it immediately showing his hands being empty. Next he takes out a key-case from his inside jacket pocket, which has a bunch of keys hooked to the case. Amongst the keys is the spectators finger ring! Hooked to the case same as the keys!