Similar for me, but I was always a bit morally dyslexic and decided to send “This school has been hacked” or some such. This was before computers were really used in school much other than the 1 computer room to teach touch typing and/or some basics, so our school didn’t have a proper IT team but instead used some local external support business. The school panicked and shut down every computer and printer until they could come “fix” it.. 2 days later.

I got suspended for a week and banned from the computer room for a year.