I think almost everybody has a story like this. when I was in grade 12, I got a job as the sysadmin of three linux labs at my highschool. I didn't have a lot of sysadmin experience, but part of grade 12 comp sci was to give students a chance to learn something.

One of my first perl scripts (c'mon. it was 12 years ago) was to adjust something about user accounts. I dont remember what it was, just that the result was deleting the home folder of every single teacher at the school.

a very honest mistake.