For example an assistant can be chasing the bottle, and every time he selects a cylinder, he finds the wine glass under it, while the bottle appears under the other cylinder. After a few changes, as the magician is apparently talking to the audience, the assistant creeps up to both the cylinders and finds the bottle in one, which he steals away. He now smugly asks the magician to perform the trick again. The magician apparently unaware that the bottle has been stolen away, continues to perform the trick as before, leaving the assistant and the audience doubly amazed.
We supply you a set of three nested plastic bottles, two cylinders, and two glasses that can be filled with any liquid of your choice.