Quick Change Card
What a cool trick. A spectator selects a card, they put it back it the deck. The deck is shuffled, you then show a clear plastic sleeve on both sides, it can clearly be seen through. You grab the top card off the deck and slide it into the sleeve face down, you then turn the sleeve around so they can see the face of the card. But OH NO! You got it wrong! You ask what their card was, give the sleeve a little shake, it VISIBLY changes to their selected card! VERY EASY!!