It happens right in front of their eyes!
This is a very easy yet very amazing and entertaining version of Two Card Monte! If you can hold a card in your hand, you can do the trick!
You show your spectator two cards that are exactly the same- except one has a circle punched out of it, and the other one has a square punched out of it. Take the card with the square hole and place it behind your back. Ask your spectator which card is in your other hand. Of course, he will say "The one with the circle hole". NO! It is the one with the SQUARE hole- the card with the CIRCLE hole is now behind your back!
You repeat this several times, and every time, the card behind your back mysteriously and invisibly changes places
with the other card!