Sim Sala Bim
Deal out three piles of seven cards each. (Deal them just like dealing hands for a card game.) Have the spectator choose a pile. Hold the pile up, so the cards face the spectator. Have him/her choose a card, without telling you or pointing it out. Place the packet you hold in between the other two packets. Deal out the cards into three piles again. Hold up each pile separately, asking the spectator if his/her card is in the pile. When they say yes, place the pile with the chosen card in between the other two piles again. Repeat this step two more times (for a total of 4 times.) After the last time, hold the twenty-one cards up, and recite the magic words: "Sim Sala Bim." Next, deal the cards, one by one, spelling out Sim Sala Bim, one card for each letter. The next card (after you spell out all three words) will be the spectator's card! They will like this trick!