I saw kids do this all the time in the Forum at Penn State. Just casually slamming beers while the professor was screwing around with some stupid Power Point presentation or something. TAs don't even know, too, because they're all chillin' in the front of the lecture doing their TA thing. Total Bro move, guy. Total Bro move.
Sorry for partying?
[H/T: Total Frat Move]