I have two professors that I have strong memory of.

The first thought classes that she was not qualified to teach. Using methods outside her narrow window of understanding hurt your score. She set a rule that if you ask for her to recheck a question on the final you will lose 20 points. On my final I had a minus 20 because she doesn't understand powers of 2.

The second is brilliant but very absent minded. Gave us a badly worded question. It was meant to be a very hard question and I didn't know the subject well enough to solve it. Used mathematical logic to prove he didn't ask what he thought he was asking. And solved the very easy question he actually asked.

He gave me a perfect score and a job.