A packet of eight cards is shown. All eight cards are different on the face. The backs however, are not shown. It is explained to the spectator that there is one card and one card only that's back is different than the others. The spectator decides on one card. That card is held by the spectator, while you show the backs of the unselected cards. Those seven cards have blue backs. The spectator then turns over his selection, and it has a red back! All of the cards can be given away to the spectators.