I helped write parallelknoppix when I was an undergrad - our university's 2nd cluster ended up being a bunch of laptops with broken displays running it. Took me a whole summer.

Then the next semester I am denied the ability to take a parallel computing class because it was for graduate students only and the prof. would not accept a waiver even though the class was being taught on the cluster me and a buddy built.

That I still had root on.

So I added a script that would renice the prof.'s jobs to be as slow as possible.

BOFH moment :)