(My pre-calculus teacher is useless. At the beginning of every class she simply recited verbatim out of the book and made us take notes. When we checked our tests or homework, we had to discuss among ourselves any answers we got wrong, and she flatly refused to help, even when there were questions that NO ONE got right. She was out for extended medical leave, and we got a substitute who, while very nice, didn’t know much about math. On the day our usual teacher came back, half of the class was absent on a marching band trip.)
Teacher: “So! Tomorrow I’ll be testing everyone on all of the material you were meant to cover while I was gone! And I was gone quite a while, so this will be a very big test, constituting 30% of your grade.”
Us: “But… we barely learned it! The sub didn’t know what she was doing!”
Teacher: “Well, you should have figured it out on your own, then.”
Us: “And half of the class is out today! They won’t know to study!”
Teacher: “I guess you’ll all just have to contact them, won’t you?”
Us: “That’s your job, not ours! And not everyone in this class has friends in it!”
Teacher: “Well, that’s just too bad for them.”
(Nearly everyone did poorly on the test. What was worse was that this teacher was already retiring at the end of the year, so there was nothing that could be done to penalize her for this behavior. One of my best friends actually had to go to summer school due to her poor teaching. He’s now a mechanical engineer.)