1. Borrow a bill. Any currency works!
2. Have someone SIGN THEIR NAME on it.
3. Blow up a balloon, TIE THE END.
4. Push the signed bill INTO THE BALLOON WITHOUT POPPING IT.
5. Give out the balloon, have them shake it, they can really hear it in there.
6. End by popping the balloon to prove the bill was the exact same one they signed.
An incredible party trick that's fun, and SUPER EASY.
Mark Jenest is one of the most successful performers in history, and this is one of his reputation makers.