The Boston Tea Party by David Devlin

Effect: A copper English penny is shown and can be totally examined (it is real). Attention is now drawn to a small, round box. The lid is removed and four silver half dollars (also totally examinable because they are also real) are tipped out of the box, which is otherwise empty. The copper is now placed slowly and cleanly into the box, and the lid is placed on top. A silver coin is simply tossed into the performer's hand. A magical gesture is made, the performer opens his hand, and it is seen that the silver coin has changed into the copper coin! The lid is removed from the box and a silver coin falls out. This is repeated three more times, each time more magical than the last. The final transposition is nearly instant. The copper coin is held openly at the finger tips. With a wave of the hand, the copper coin instantly changes to silver. The hand is otherwise empty, and the coin is immediately (i.e. no switch) handed out for examination. The copper coin is found back in the coin box!