Card Mentalism DNA
Effect:you give the spectator a card. IT IS REALLY A FREE CHOICE. You then explain than in those CSI shows that thay use DNA. You cut the deck as many times as you want. You flip over the cards until you stop at the next one in the deck and say that this one is suspicious. you flip it over and it is their card!
Secret:when you are about to cut, discreetly look at the bottom card. make them put the card on top. then cut the deck. the card should be the one after the card at the bottom you lookedat earlier.