The good news is if you don’t know an answer on a test, just write “pierced nipples” and you’ll get an A.

And maybe a D, too.

Well, that didn't end up where I thought it was headed at the end of the first sentence. How many students are in the class, and how likely is it that he'll recognize you as the person who "woofed" at him? IOW, how likely is it that he'll think you were just trying to get into his pants for a better grade? To me, THAT would be the potential "FML" of the situation, not your personal epiphany that professors are human beings who can (a) be attractive and (b) have pierced nipples.