Card trick behind the back

Effect: Tris is a very easy card trick. A spectator shuffles a deck of cards and hands it to the magician while his back is turned. The magician holds the deck in front of him, showing the bottom card of the deck to the audience only, and the audience to name that card. The magician does this a few times, shuffling the cards behind his back and showing the bottom. After the about the third time, the performer begins announcing the names of the cards himself. This is repeated several times, the magician is always right!

Secret: While the deck of cards is behind your back, pretend to shuffle the deck and take the top five cards off. Flip these cards over, face-up, and lay them back on top of the deck. Hold the deck up for the audience to see, without looking at the bottom card. Looking at the back side of the deck, remember the card that is flipped over. Put the deck of cards behind you again, turn the top card you just looked at over and place it on the bottom of the deck. Now show the bottom of the deck again, this time announce the card you just remembered. Note the card on the back as before, and repeat the process until all five cards have been turned over.