After forcing a card on a spectator you remove a jumbo (4 x 6) card from an envelope. You show the card and ask if this was their selected card. It won't match but you explain it is a "Switch Card". Turn the card so the back faces the audience and they see a light switch attachedto the card. Ask them to name their card and when they do you flip the switch and turn the cardback over to show it is now their selected card! Great comedy for MC's or magicians.