Midterms?

Guy #1: Dude, the prof is such a bitch!
Guy #2: Yeah, it must've been that time of the month for her.
Girl: That is, like, so incredibly sexist! Ugh! [Storms off.]
Guy #2: What the hell was that all about?
Guy #1: Must be that time of month for her, too.
Guy #2: For real.

Shout-out: www.overheardatmcgill.com