Fan a deck of cards face down. Invite an audience member to choose two cards and memorize them without allowing you to see them.
Place the deck behind your back and pretend to shuffle them. Instead, turn the bottom card over and then turn the entire deck over.
Square the deck carefully and bring it from behind your back so the bottom card is on top. It will seem as though the entire deck is face-down instead of only the top card.
Instruct the audience member to place the two cards into the middle of the deck.
Place the deck behind your back and pretend to shuffle them. Again, turn the bottom card over and then turn the entire deck over.
Square the deck carefully and bring it from behind your back so the bottom card is on top. It will again seem as through the entire deck is face-down.
Fan the deck or place it on a table and spread the cards. The audience member's card will be the only ones turned face-up.