They’ll love this one, because it happens right in their own hands! You show two bottles and two covers. A spectator uses one of the bottle-cover sets and you use the other. Both covers are shown empty and placed over the bottles. Now, the spectator must do exactly what you do. Tip the bottles back and forth, then forth and back. Now lift the covers. Your bottle is exactly right side up. But, his is upside down! How can that be? Try it again. Again, he does exactly what you do. And, again, his is upside down and yours is rightside up! As a climax, your bottle instantly turns over to match his. Comes complete with real glass bottles, covers, and routine.
