My daily beater is a '93 Honda Accord. Got a few scars on it, for some reason, other drivers have been attracted to it, and hit it a few times, even while it was parked. Some vandals have broken the antenna, and kicked off the mirrors (Along with every other car in the street where it was parked then).
So it's full of dents, different colored mirrors, mis-matching lights and headlights, slightly sagging front bumper, and in general looks like I beat on it like a redheaded stepchild.
This is very helpful in city-traffic, because no-one with a more expensive car than mine are senseless enough to try to force their way in front of me when I clearly have a right of way and obviously won't mind getting a new front fender at their cost.
Still, I do give way to those which I can see are struggling with the traffic.