They'll beg to know how you did it!
Mindboggling mentalism effect! It seems like your spectators have free will, but they can NEVER choose the correct key to open the wallet!
The effect: Show a zippable leather wallet. Fold up a real bill (the larger the denomination, the stronger the effect!) and place it inside the wallet. Zip the wallet closed, then secure the zipper with a small padlock. Show five keys, and assure your audience that one, but ONLY one, of the keys opens the lock. You will select four audience members, and each will choose one of the five keys, leaving you with the one last key. Announce that if any of the audience members' keys opens the lock, that person can keep the bill inside!
The keys are mixed up, each person FREELY selects and holds one key. You hold the key that was not chosen. One by one, the members try to open the lock. None of their keys work. At last, you come forward with the key that was not chosen, and THAT is the key that opens the lock! Your bill is safe with you!
This trick is ingenious in the way it works. The effect is very, very strong- your audience will be talking about this for a long time to come!
