Just now, I was playing with randoms on RR and we killed the professionals and done the mission as we supposed to. I went to pick up the briefcase and ran back to my car. When I got to my car, I got ran over by one of my "teammates" and he blew up my car. Then, the asswipe got out of his Turdismo and stole the briefcase.
The same thing happened yesterday and the day before that. It's getting to the point to start playing by myself. So the question is, why is everyone a dick in Rooftop Rumble?