Borrow a 50p coin form the spectator. Hand the spectator an empty bottle to hold. Take the borrowed 50p and hit it against the bottle. The coin penetrates the bottle and lands inside. You then remove the 50p from the bottle and hand both the coin and the bottle to the spectator for examination.
You can use ANY Bottle!
VERY easy to perform!
Difficulty level 1 (Basic sleights/self working)