1. remember the Bottom Card.
2. fan the card and make the spectator choose a card.
3. ask the spectator to put the selected card at the top of the deck.
4. cut the deck into two half.
5. put the bottom deck into the top deck.
6.make a shuffle (not too much) and the selected card is just below the bottom card that you remember ealier..
p/s: this trick is very effective when you have done several other more complex trick..they will never ask how do you do that anymore!!