Show two boxes to your audience, allowing them to see the inside of each. The boxes appear to be nothing more than an ordinary pair of empty boxes with sliding drawers. However… when you close the drawer of one box, the drawer from the other box mysteriously opens! To prove that there is no connection between the two boxes, you insert a playing card between them. The drawers still magically open and close as if by magic. For a surprising finish, the boxes are completely separated from each other, and they still move in sympathy with each other!