Have you ever been walking towards the entrance of a building with a group of people, each holding the door open for the next person as they go through? Well, typically it goes very smoothly and when done the right way the door is only opened once and simply held open as the group goes through. But then ever once in awhile, usually some skinny ass person decides that they shouldn't bother holding the door as they go through, instead they just slip through and let the door close on the rest of the people going through forcing them to open it all over again. Now I realize this isn't a big problem, it doesn't do any major harm but it is a prime example of pure rudeness that seems to go unpunished so I urge you, whenever you see one of these people on a regular basis, shut the door on their fucking arm.