Hours of fun can be had with this.
Hold down the ALT and CTRL key together and then press a curser arrow key. The screen will the move sideways, upside down or whatever direction the arrow showed. Return to normal just by pressing ALT and CTRL and up arrow.
This works with Windows XP and can even be done to a computer that is at the log in screen.
Childish but the looks on some peoples faces makes it worth it. Make sure you stop them doing anything stupid though like phoning for support.
Tom