The spectator is encouraged to inspect a Coca Cola bottle to make sure that it is solid. It can be bashed with a solid piece of wood showing or banged on a hard wooden surface to show it to be virtually indestructible. You take the bottle back and concentrate on it and with an explosion reminiscent of a rifle shot and exactly on your command the bottle shatters completely. There are also hundreds of other variations on the handling, for example you can just apparently blow into the bottle and it shatters.
