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.
http://www.overheardatmcgill.com/archives/2007/04/17/if-this-isnt-funny-its-your-time-of-the-month-too-ok/