Purchase two identical decks of regular playing cards.
Select one card from the first deck and a duplicate of that card from the second deck. Select a random card from either deck. Line the three cards up in your hand so the duplicates are on either side of the random card.
Slide the three cards on top of each other and place them on the top of one of the card decks. Remove the top duplicate card and show it to your audience. Slide the card into the center of the deck. The duplicate and random cards remain face down on top of the deck with the random card being on top of the duplicate.
Select the two other cards from the top of the deck, taking care to hold them together tightly--your audience must believe you have only one card in your hand. Show them the duplicate card, which should be facing out from the palm of your hand with the random being out of sight behind it. Bend both cards in half while keeping them together to appear as one. Show the audience that the "card" is bent.
Replace the cards on the top of the deck and hold tightly so they don't spring up. Pick up the top card (which would be the duplicate, bent card) and show it to the audience once more. Do not, however, show the face of the card. The audience must believe this is the "random" card. Once you've shown the back of the card to the audience, place it in the center of the deck while holding your index finger on the crease of the top card so it doesn't jump up.
Verbalize to the audience that you are now going to make the original card "jump" to the top of the deck. Move the cards to your right hand and hold them tightly at the sides with your thumb slightly covering the top card to hold it down. Snap the fingers of your right hand while simultaneously releasing your thumb from the top of the deck so the bent top card springs up.
Show the card to the audience.