Magician shows a card printed with 5 playing cards, both front and back. Four of the cards have black faces and the one in the center is red. The object is to place a paper clip on the red card while the cards are face down.
Sounds simple? Surprise! The clip is on the wrong card.
SECRET: On the face of the card the four of Spades is the only full card. When you turn the card over, your first impression is that the full card on the back is a four. However, from the front it is the ace and two.
With the card face down, ask the spectator to place a paper clip on the red card. They will choose the middle card. But when your turn the card over, the clip will be on the four.