Shuffle the cards in front of your volunteer and then fan them out. Ask her to point to any card in the deck that she wants.
Remove the card from the deck and set the other cards aside. Hold the card so that its trick side is facing away from your volunteer and the card is sideways. The trick opening must be facing downwards so it is important that you know your deck really well and are able to do this smoothly.
Bring the card up and smash it down on top of your arm. The card’s trick curved opening will open up and make it look as though part of the card disappeared into your arm.
Hold the card there for a few seconds and then pull it up from your arm. When you do this the trick opening will close and the card will appear whole again.