Only exception I have seen was when the professor was kind of a troll. He was a good teacher. This was in a pretty entry level physics class at a tech school, so we basically got a high school level physics as a pre-req for our degree in whatever 2 year program we were in.

He spent the week leading up to the first big test talking about how hard it was, how people needed to take it seriously, etc.

He handed out the grades after and everyone was visibly upset, nobody had a passing grade. Then he explained, after letting us freak out for a minute, that the score at the top was out of 50, not 100 and I think everyone passed

After that the class pretty fun.