I had a class that was so easy that most students didn't bother to show up for lectures. Near the end of the semester the profesor got angry that nobody came to his lecture and decided to retroactively grade attendance with 70% of the grade. Most students flunked. I was fortunate that his class was in between two others I was taking, so I attended about half of the lectures and passed it with a grade that corresponds to the American C+/B-
