Magic and Audience Participation together!
This one's great fun, because your audience is constantly telling you what to do. Yet, when you do as they ask, they are left completely amazed!
Show a beautiful wooden box, from which you remove a die resembling a multicolored Rubik's Cube. Show the cube on all sides, and place it into a Die Box having two doors in the front, and two doors in the back. There's fun byplay with the audience, as you tilt the Die Box when you ask where the cube is. Naturally they think you slide the cube from side to side when you tilt the Box and open the wrong door. Still, after doing this several times, you finally open ALL doors (including side doors and the top of the box) - the cube has vanished! Return to the first wooden box and, lo and behold, the cube is back in the box - and, the cube is shown on all sides to be solid! A real shocker!