You begin by turning the top card of the deck face up. You proceed to write a prediction across the face of that card. You then spread the cards face up between your hands and ask the spectator to name any one of the cards they see. They may choose any card; they can even change their mind. No matter what card is named, the deck is turned over to reveal your prediction is 100% correct!
A remarkable demonstration of clairvoyance under the fairest of conditions!