One of magic's classic gags, now available with RED Bicycle brand backs! Custom printed by the US Playing Card Company. Poker size playing card.
Have the spectator select the Seven of Diamonds (by whatever card force you prefer) and then double the value of the card and that will match your prediction. The spectator will think that is odd because the value is the 14 of diamonds and there is no such card.
Show the prediction to be correct as it is the 14 of Diamonds.
Use this classic gag item as always. Spectators always chuckle when they see a miss-printed card like this one.
Bicycle Playing Card
Poker Size card
Knowledge of a simple card force