Take a bottle of liquid, something that is carbonated, and with the aid of a napkin form a pad which is applied to the lower end of the bottle. Strike hard with repeated blows against the solid surface of a wall, as shown in the sketch, and the cork will be driven out, sometimes with so much force that a part of the liquid comes with it and deluges the spectators, if desired by the operator.

Ill: Removing the Stopper