How many Redditors got in trouble for messing with their high school's computers?

I was thinking about the good ol' windows 98 login bypass that got my friend out of school suspension after he logged into the teachers payroll program and messed with their paychecks.

I remember being a bastard and I would add password protection to the bios boot randomly on some of the computers one day. I also remember sending artwork of body parts made in paint to the network printer and watching the teacher go around to try to see who did it. Someone always had paint open and wasn't paying attention so they always got the blame. It was always hilarious.

What were the best stories you have?