The topic should got the title of impolite driving techniques. Cross in front of people and showing the middle finger? I was talking to myself and sometimes shout while the windows were closed when i get angry, but never done that. That show you how civilized was that person, instead of apologizing for his bad deed he comes to show you the best and the only thing that he is good in doing in this life. Bear with him, he does not have anything in mind but to do that.

Ignore such people and let them do whatever.