477 Tricky Turvy Bottles
The performer invites a spectator to assist. Each takes a bottle and a cover. Magician directs the spectator to "do as I do". He covers the bottle with the cover and direct spectator to do the same. Holding hand on each end, the magician turns the bottle end for end several times and asks spectator to do the same. When the covers are raised, The performers bottle is always upright, while the spectators is always upside down!