This video shows you how to get a hardboiled egg in a bottle even though it does not fit through the opening. It is possible to do this without breaking the egg.

The full version of the historic speech by Martin Luther King, Jr.

Using an IR led array and some reflective tape, you can track fingers in thin air using the Wii Remote by Johnny Chung Lee, Carnegie Mellon University. The grid software is a custom program written using a C# wiimote library and DirectX.

It does not get much more futuristic than this: a demo of holograms one can actually touch. The holographic tactile display uses ultrasound to exert a pressure field - for example, it will exert pressure on the surface of your palm when virtual raindrops fall on it.