I'll add my story to the list here: One Intro to Physics (for majors and engineering) professor was the toughest and reveled in it. The class, in general, was

I'll add my story to the list here: One Intro to Physics (for majors and engineering) professor was the toughest and reveled in it. The class, in general, was a weeder class, so we all knew going in that it was meant to be overly hard. The final though. My lord. It was hard, yes, but he put a little extra bit of psychological torture into it: It was a 'choose your grade' final. In that, he had written four separate final exams. One was a D, one was a C, one was a B, and one was an A. You had to choose which final to take, and that would be the grade you got for the exam, providing that you passed that test. If you didn't pass you got an F. You could only choose one exam to take, no trying to finish the D quickly and then move up to a B. I think only one person had the chutzpah to take the A level test. Everyone else struggled along with the Bs and Cs. Which, I unfortunately have to remember, were very difficult themselves.