In middle school social studies class, the teacher gave us one of those quizzes that came with the textbook teaching materials. One of the questions on the quiz showed a line graph representing the depth of the Chunnel at different points along its length. The question (multiple choice) was "how deep is the Chunnel at its deepest point?" All you had to do was find the lowest point on the line. Everyone in the class chose the same answer because it was an absurdly easy question and because only one of the multiple choices even remotely made sense. The teacher said we all got it wrong because the textbook instructor guide answer key said something different. It was obviously a misprint or typo in the instructor guide, the answer it listed didn't make a bit of sense no matter how you looked at it. The class spent a good twenty minutes trying to convince our teacher that the answer key was wrong and trying to get her to explain how the stated answer could be correct. She just kept insisting that the answer was in the key, so we were wrong and that was the end of it. She couldn't even entertain the idea that a mistake had been made, so all of us lost a point on that question.

She wasn't even mean or a hard-ass or anything. She was actually very nice but obviously had no critical thinking skills whatsoever. Terrifying that someone like that can become a teacher, but actually when I think about it, she's probably exactly the kind of teacher the system wants. The real lesson she taught that day was to not think for ourselves and trust authority even when it makes no sense to do so.