My bitch is directed to groups of people who attempt to enter/exit buildings at once, who—although there are, at the very least, two possible doors to go through—only have tunnel vision to the one door that traffic is slowly trickling through, while a unnecessary cluster of people builds up waiting to get through the open door. Throw in some inattentive people attempting to walk and text and you're pretty much at a stand still until the herd can clear out of the way of the other doors. Some people figure it out but the mindlessness of the mass is frustrating to watch, and even more so to be stuck behind. —PetPeeveRelieved