DO NOW:

I wouldn't consider this a harmful joke, because he is still hacking into the school's network and he is trasspasing private property. I think he would get into a big punishment, because he did things he wasn't sopossed to. I would suggest that even those words "It's MY School" is harmful to the school, because it is being disrespectful to authorities. Thinking about what he did it is not a joke, because saying that you own the school is not fuuny its rude to administators and principals.