Most of the stupidity in my high school was things involving computers
In one of the rooms, the monitors were on these really fancy stands that could raise/lower, and rotate it on all three axis. But we weren't allowed to adjust them, at all
The same monitors had a native resolution of 1680x1050, but were set lower than that, to (i think) 1280x800, and the teacher of the room would yell at you if you changed it. And this was in the CAD/Graphic design room
Also, not really a rule, but I was blamed for breaking a dvd drive, and the school wanted me to pay $100 to have it fixed