The Changing Card
Effect: A spectator picks a card. Then he (or she) takes the rest of the pack in his hands and puts the selected card on top of the deck. The magician takes the pack of cards and takes off the top card. The magician asks the spectator what his card was. He flips over the card and it is not the selected card. The Spectator's Card has Changed!
When the spectator picks the card and looks at it, secretly palm a card off the deck. Hand the deck to the spectator and tell him to place his card on top. When you take back the deck, act as if you are squaring up the deck but actually place the palmed card on top. Take off the top card and ask what his card was. Flip over the card, and it has magically changed into another card.