The Nothing Box
You hand out a small metal tin saying that it contains one of magics greatest secrets. Shake it and you can feel and hear something inside, pass it around and let people shake and guess what is inside the small metal tin. Open the tin and the only thing you see is nothing!
Its completely empty this will even fool magicians. The box can be handed out for inspection. A great party trick.
This trick is also known at the secret box. Watch the video demo.