I don't have any extreme cases. I didn't like my high school World History teacher. She wasn't mean or stupid or anything, but apparently she thought that "world" meant "Europe". Literally the only non-Europe stuff we learned: early on, ancient Egypt, and then in WWII Japan shows up to get bombed. She claimed that if we didn't miss a week of school due to hurricane evacuation she would have covered the middle east, but I didn't believe her.
Wasn't a fan of my physics teacher either. She wouldn't call on me when I raised my hand to ask a question, and then she wondered why I was failing. The class was mostly sophmores and I was one out of two juniors, one time she decided to have us juniors do a separate project while she taught everyone else something. Then when it came time for the sophmores to do a project, she decided to have the other girl and I do it too. Problem was, the project revolved around what she taught while we were doing our separate project, and the other girl and I had no idea what to do, and it was a group project so the other girl in the group got really mad at us. This teacher was all nice and stuff and everyone liked her, but I didn't.