A bottle and a glass are displayed to the audience and placed on the table and covered with two empty tubes.
Picking up the covers, you see that the bottle and the glass have changed places. Do it again to restore the original position.
Do it again and much to the audiences surprise, when you pick up the tubes, two bottles appear from beneath the tubes.
Every time you pick the tubes, two more bottles appear until there are 10 bottles on the table.