Remember & Forget by Michael Vincent

During the explanation of a strange paradox, Michael asks three spectators to both remember and forget a card. To facilitate this, each spectator selects 2 cards and loses them back into the deck. They are then asked to focus on just one of the cards they selected, thus remembering one of them and forgetting the other. One by one, Michael finds each selection before placing them on a table with their backs to the audience. As a kicker, the selections then turn into the cards that were forgotten about.