Senior year of high school, I fiddled with the school computer.
You see, they blocked the execution of your own programs, use of command prompt, right clicking outside of apps for the most part, internet filtering too.
They did not, however, block the execution of batch scripts. That is, they didn't until I got finished with them.
One day in my computer programming class we had a sub who basically let us do anything. I had read about using a batch script to essentially get back control of the command prompt. So, I whipped it up, ran it, and voila! So then, I had me a little fun, and went to send a net send message to everyone else in the class. Being that they jacked around a lot, calling them boobs would suffice. Stupid me, I fucked up the syntax, and the message ["boobs"] was sent not to everyone in the lab, but to every on computer in the middle/high school.
I was found out, later brought to the assistant principal by a computer teacher whom was using an overhead projector/smart board to teach a class of 6th graders as it happened. Turns out the assistant principal was meeting with a parent when it happened too.
Being me, I was still able to go to school functions, was only not allowed to use a school computer without supervision for a week [pfft
], and couldn't talk about it, but by now just about everyone in the small-assed middle/high school I went to found out about it.
I later found out that I had knocked out the internet filtering at the same time as I accessed the prompt.