Penn and Teller Reveal the Secrets of Their Famous Magic Trick

Penn and Teller show how one of their trademark tricks is done!
Ozone Magic is the home of magic on Youtube, giving you all varieties of magic tricks. Here are playlists per category:
Sleight of hand/card tricks
Mentalist acts
Levitation tricks
Escape acts & dangerous illusions
Magic tricks revealed
Magicians who fooled Penn and Teller