Money Mystery Box
Kennedy, John
John Kennedy Magic
Cautioning the audience that he's just kidding, the magician goes on to say, "You can have your dollar back, or you trade it for what's inside the box resting on the table." Whichever the spectator chooses, he's in for a big surprise, because the magician then picks up the box, has the spectator remove the lid and dumps out the spectator's signed bill.
The Money Mystery Box seems impossible because no one ever went near the box from the time it was set on the table. Works with any U.S.A. currency-$1's, $20's, even $100 bills. Just like the other Mystery Boxes, you can show the inside of the box empty after dumping out the bill and it's completely examinable.