My chem professor in college was like that, to an extreme degree. He openly declared that he was going to put trick question and gotchas in quizzes and pop quiz

My chem professor in college was like that, to an extreme degree. He openly declared that he was going to put trick question and gotchas in quizzes and pop quizzes—all of which counted towards the final grade, mocked students who got tricked, insisted to talk in an opaque manner, and dismissed any objection to his teaching style. It was the only way to learn, he claimed. But at midterms and finals, his class scored consistently worse than the same course taught by a different professor, even though he was the one writing the exams. And he got angry every time this happened.