Really bend a spectator's signed coin!
Begin, by asking who has some change you can borrow? Borrow a quarter, have it initialed or marked, and then demonstrate a little trick that your friend, Superman, taught you. Hold the coin between your fingers of both hands and show the spectator that if you quickly work the coin back and forth, it gives the illusion that the coin is bending. Hand the coin back to them, and watch their surprise when they see that the coin is really bent!
Excellent trick! The BORROWED coin is really bent!