First, deal 3 columns of cards with 5 cards in each column (5 cards up and down). Then find their card the easy way. Keep the row with the spectator’s card between the other two rows. Once you have found the row with the spectator’s card, put the other two rows into the deck and ask the person to cut off half the deck.
Pick up either half-deck and put the five cards on it one at a time, placing them so that the first, third (the selected card), and fourth cards project about an inch beyond one end of the deck, and the second and fourth cards project about an inch beyond the other end. Then place the other half-deck on top, so that three cards stick out of one end of the deck and two cards out of the other.
Grip the cards by the sides so that two cards stick out of the top, and three out of the bottom. Push them down onto a hard surface so that the bottom cards are pushed up into the deck. This will the two cards at the top to stick up higher. Flip the cards over and repeat with the two cards at the bottom. The card that pops out will be the spectator’s card. Whew =)