People that have no concept of how to use an expressway on ramp, ie: They roll down the ramp at 35 talking on their cell phone or with their finger up their nose or whatever and finally 50 feet from then end of the ramp they realize they should probably look around to see if they can merge, but of course they can't since they are going about half the speed of the traffic flow and yes, you guessed it they slam on the brakes and stop.
I'm the opposite. I get over as soon as possible. Screw you if you're in my way...
(Not really)
Here's one a few might get. When you're at the shooting range and some idiot walks up to you and wants to talk about your gun and tell you that their cousin/uncle/ brother in law has the same thing, only in green.