Gatekeeper | Craig PettyhYou introduce a brass key and a coin. You then tell your audience that you will give them $100 if they can push the coin through the hole in the key. After the audience tries and realizes its impossible, the magician offers to show them how. With just a rub, the hole in the key magically stretches ten times in size to become a coin sized slot. The magician can then easily drop the coin through the key before shrinking the hole to its normal size.