EFFECT: A spectator selects a card in an extremely fair way. She shuffles her packet, makes a free selection and then buries it while the magician's back is turned. The magician takes the deck and with a snap of his fingers claims to have made the selection become invisible. The invisible card is "removed" and tabled. To prove this claim, the cards are spread face up, and the spectator verifies that the selection is nowhere to be seen. The magician "looks at" the invisible card and names the selection! The invisible card is replaced in the deck and is magically made visible again. The deck is spread to verify this. One card is seen to now be face down in the face up deck. It is the selection!
Mike Powers' Card Corner On The Portal