Clueless PE teacher for me.
"If you install Doom on one of these computers again, I'll have you expelled. You could have infested every computer in here with a virus."
[the computers were not networked]
Early 2000's: my brother got clueless music teacher, but it was more inane - "change the wallpaper again and you'll be suspended, you dirty computer hacker, you".
It seems high school computer classes haven't come a long way.
In the mid '80s my primary school had C64s available. They really were a treat though, having games like Cave of the Word Wizard (https://www.youtube.com/watch?v=iJIubj1PsdY) to play.
I happened to have a C64 at home (by coincidence, since our grandmother sent it to us as a gift). I was more interested in making it do things than playing games on it so I started learning BASIC. I outgrew that pretty quickly. I remember there were a couple of other kids at school in a similar situation and the school brought in a programming teacher who ran special classes for a couple of hours a week (remember, primary school age kids) that really pushed most of us into bigger things. I was programming 6510 assembly by the time I got to high school.
High school (early '90s) had a network of BBC micros. Teacher seemed to actually know about them and he was very willing to sit around at lunch times and after school offering up advice to anyone who was genuinely interested in learning. School curriculum forced everyone to pass the typing test (which a few of us did on the first go, but most others spent a semester learning). I remember this awesome kingdoms game that was available on the network, but I cannot remember the name. I can also remember learning all about how to do nasty things to other people's terminals over the network. Security was pretty lax, and it was frowned upon, but our computing teacher always encouraged ingenuity and nobody ever really got more than a polite "you really shouldn't do that" talk.
Later on (mid '90s) , the high school installed a network of Win 3.1 PCs and a Novell server. Just as much fun. It was really quite amusing defacing the Windows 3.1 splash screen. Same awesome computing teacher, but now the school decided Visual BASIC was the go. I remember being amazed at how other people would struggle with concepts that I found trivial at the time. Being old enough to reflect now, I can see that I found them difficult when I had learned them years before.