The magician displays a nickle in the palm of his hand. He closes his hand into a fist, turns his hand over to show the back of his hand momentarily. He turns his fist palm side back to the audience, opens his hand, and the nickle has disappeared! The procedure is reversed and the nickle reappears! Sound impossible?
Doug Henning performed this great trick by John Cornelius as the first effect on one of his early television specials. It is a great trick for video work.