The magician makes a prediction and writes the name of the card on the cellophane surrounding the card case. The prediciton is shown to the audience and a spectator is then asked to sign the opposite side of the card case. A card is then selected but it doesn't match the prediction as was expected. The magician makes a magic gesture then turns the card case over. The prediction now correctly states the selected card! The card case still contains the spectator's signature on the opposite side.
