it happens around the end of every semester when you, or some other unlucky chump, sits in the campus library on a couch that is way more comfortable than study-focus-appropriate and just stare because even with a laptop and papers scattered before you, there's nothing you can do because of mind-crunch-overload...
guy 1: see that dude over there with that crazy finals face?
guy 2: i think he's drooling....
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