The effect of the trick:
A spectator selects a card, memorises it and replaces it face down in a face down deck. When the performer spreads the cards face up on the table, one card is seen to be face down. It is the spectator’s chosen card.
Before you begin your performance, you need to turn the bottom card over so that it faces the opposite direction to the rest of the cards in the pack.
Move the deck towards the spectator fanning it slightly in the process. Make sure that you do not let the spectator see the card which you have secretly turned over. Get the spectator to select a card and whilst he or she is memorising it, secretly turn over the deck so that the reversed card which was at the bottom of the deck is now on top. Of course to the spectator it will look as if the reversed card is the top of the face down deck.