The magician shows several same cards that a monster holding a spoon. He takes out the bottom of the cards, and asks one audience to touch the card. Turn over the card and find that the spoon is bended.
Then take out another card, 2 audiences touch the card, finding the spoon is bend and twisted.
Finally, an audience signs on the monster, proving that the magician won't change the card. Then they touch the card again, and find that the spoon is broken.
The effect is so amazing.