Pet Peeves

It's usually entire groups of people doing it, too, which is weird cause you'd think at least one of them would have a light bulb go off and signal to their group to step aside.

Who stands in the middle of a hall, aisle, or sidewalk and doesn't move over when someone walking towards them gets their attention? Do these people also breathe through their mouths and sit in their driveways chewing rocks and drooling in their free time, too?