From an entry about education litigation by Kevin Drum:

It does remind me, however, of a professor friend of mine who basically has gotten to the point where he virtually never gives a grade of less than C in his classes. “It’s just not worth the hassle,” he says with a sigh.

Well at Brown we solved that by making C the lowest passing grade. Which makes giving Cs something of a hassle, but some brave souls are prepared to take the challenge. (In the interests of my students’ privacy I will neither confirm nor deny whether I was one of the said brave souls this year.)