First get a deck of cards. Then fan out the cards and ask the person to pick a card. Fan out the cards and ask them to put the card in anywhere they want. Then stick the card out and say "is this your card?" while bending the back of their card. Then close the deck and take one card from the top and one card from the bottom. Put one in on top of the folded card, then one on the bottom of the folded card. Then hold the deck up and down with the cards sticking out. Then flick the cards and the card that pops out should be their card.