The Clipped Card

In the "Clipped Card," you show a spectator five cards and ask them to remember the position of the middle card (queen). You turn around the five cards and ask the spectator to clip the middle card (queen) using a paper clip. Most spectators will clip the middle card. But when you turn the cards around, you show that their paper clip is nowhere near the queen. It's a fun exercise in perception and can act as an introduction to a card trick or an effect where you explain the difference between illusion and reality.