An outstanding double prediction
The mentalist says: "I want everybody to take a trip down memory lane, to a happier time, remember your life at elementary school".
You 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 it’s impossible, the magician offers to show them how.
Imagine a gift box with multiple activities for the spectator to choose that allows you to predict a surreal experience that will be unique and unrepeatable!