Unfortunately, school networks are often set up by people better qualified for teaching other subjects and as such they often leave things open for enterprising, morally undeveloped, children to get their metaphorical tendrils into.
This is how I ultimately ended up being banned from all computers in my school except one. It took them a while to figure out how to do that but I guess it became a priority what with all the “scary” things I was doing.
As I understand it, I was still getting the blame for things after I left.
Way back, there were some rare keyboard / motherboard combinations where the motherboard couldn’t detect there was a keyboard attached unless a key was pressed on it. That message was for those people with those combinations.
You pressed F1 and the computer would be like “my bad, there is a keyboard there, thanks for your help”, or rather it would just shut up and boot.
The message could have been different but it had to fit in a small amount of BIOS ROM, so we got stuck with the one that covered all the bases the best, and unfortunately, most people who saw it didn’t actually have a keyboard plugged in, thus, irony.