People in average size cars who, when turning left, have to swing out to the right into MY lane as if they are driving some kind of big rig or aircraft carrier. Grrr!
I saw a bobtail truck try a U-turn from a left lane next to a Prius. He must have had 8-10 feet hanging behind the rear axle. As he turned, his right-rear corner wiped the side mirror off the Prius like it wasn't even there. I had to laugh!