Effect: Borrow a bill, ask to sign it or take note of the serial number, and places it under a handkerchief. Then give the handkerchief, with the bill inside, to a spectator and show a little bust of Harry Houdini (3 inches tall). Give the bust to the other spectator to keep it in full view. You then throw one of corners of handkerchief and the bill doesn't fall down to floor, it's disappeared. Immediately, request to spectator (that has the bust) open it by unscrew the base and inside of bust will be the bill with the sign.
You receive the original and special made bust of Harry Houdini and a gimmicked handkerchief.
Of course, the bust can be used to keep a message, a prediction or anything. Could be a number, a word, the name of a playing card, etc.
Easy to do.