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Performer places the small die in the box and closes the doors. He tilts the box so that the die slides over to the other side. Opening the door on the side where he placed the die, he announces that it has disappeared.
This will draw a laugh, because everyone heard it slide over to the other side. This is repeated over and over until someone says to open all doors at once. This is done and the box is shown to be empty. The die has vanished and may be produced from the pocket.