The performer invites a spectator up to assist him. Each of them takes a bottle and a cover. The spectator is then instructed to do exactly as the magician does. Magician and spectator both place a cover over their respective bottle. Holding a hand at each end of the cover, the bottle and cover are turned upside down to the right and then to the left. When finished the performer's bottle is always upright and the spectator's bottle is always upside down! This may be repeated as many times as desired. The performer then excuses the spectator stating that "sometimes magic can be very confusing".
As a climax, the performer raises his cover showing his bottle to be upright. The cover is lowered and immediately raised again and the bottle is now upside down!