When I was at school, the worst teacher wasn’t Mr A, who screamed at everyone all the time. No. It was Ms F, who never shouted at anybody, ever, but who, when we were misbehaving, would simply sit there with a sorrowful air, waiting for someone to notice. Inevitably one pupil would finally see her, and would then shout “Oy! Everyone, SHUT UP, MISS IS UPSET.” After protracted, theatrical shushing from all and sundry, a sheepish silence would fall on the classroom, until Ms F would sadly murmur: “I’m so disappointed.”
It was the WORST and we would all feel terrible. (I later became friends with Ms F and she told me she loved doing that to us and thought it was hilarious. Such sadism).