Find a marker. Split the deck to shuffle and take note of the bottom card in the stack in your left hand, as you tap the cards to even them up. That’s your marker. The pictured marker is the three of spades.
Keep the marker card in place. Shuffle the cards so the stack in your left hand slaps down first. The marker card will be on the bottom of the deck. Slip the deck together face down and fan it out, offering to do the trick for someone nearby. It’s traditional to say, “Pick a card, any card.”
Bed the chosen card. Your victim, or participant, may choose any card–look at it and keep its identity a secret from you. Then ask them to place it on the bottom of the deck–right under your marker. For illustrative purposes, the chosen card is shown in the picture. It's the ace of hearts.
Cut for effect. Cut the deck a few times to convince the audience that you no longer have track of the chosen card. Prove it by showing there’s a different on the bottom.
Pull the chosen card out. Turn the deck face up and sift through the cards until you spot the marker. The card on top of it is the chosen one. Display it to your audiences’ amazement. Pictured: the chosen ace of hearts is right on top of the three of spades, which was used as a marker.