I got a three day suspension from school for doing this. I sent something mundane like “hello” to entire school. Few minutes later, the IT admin came running down, told me off and took my details.

Made the mistake of telling a couple friends what happened. Said friends thought it would be hilarious to send swear words to the entire school (I was not there).

They played dumb saying they didn’t know what would happen and got off with one day each, I got suspended for three days.

I wouldn’t have minded so much except the next day was an inter-school chess tournament. Thankfully the sympathetic chess coach told me to wait behind the school the next morning and picked me up in the school bus.