I'm a professional computer programmer with a degree in Computer Science. Needless to say, I've seen some pretty geeky things done by some pretty geeky people, but nothing tops what a co-worker showed me the other day.

If you telnet to towel.blinkenlights.nl then you'll see an entire scene-by-scene recreation of the first (er, fourth) Star Wars movie done in ASCII!

1. In Windows go to Start > Run..., or hold down the windows key and press R. 
2. Type "telnet towel.blinkenlights.nl", without the quotes.
3. Marvel.