Don't trust Link on this one [img]smile.gif[/img]
You need to touch something which is grounded. If your computer is plugged in when you're working on it, then the metal case or frame is grounded. Touching the metal while working ensures that you are grounded as well, and you won't send any sparks flying into the PC where they don't belong.
If you do, when they arrive, they stand a good chance of damaging whatever they hit...