I guess the latest example of this would be the Joe McKnight case. Though I don't think McKnight approached the shooter's car "in anger". But approached the vehicle nonetheless. A more local example for me was a few months ago a guy was shot in the wal mart parking lot (less than five miles from my house) because he got mad at a guy for "cutting him off" in traffic.
Last night a person I do taxes for dropped their stuff off by the house. I could tell he appeared flustered and I found out why. He said as he was coming over he was stopped at a traffic light. The guy in front of him gets out of his vehicle, approaches his vehicle "ticked off" and commences to "cussin' him out" because he thought he was being "tailgated". My client told me he'd never had that happen before and he certainly didn't think he was tailgating the guy. But one thing he said that prompted me to start this thread. He said "Though the guy ultimately didn't lay a hand on me. I truly and genuinely felt I was in danger and was a split second from pulling my pistol on the guy."
Wow! This could happen to anybody and it begs the question (for me at least). If you truly feel you are in danger do you legally have to wait for the person to physically attack you before defending yourself? I know the laws maybe different from state to state.
On the other side of the coin. Over the years I've known people who have been the person to get out of the vehicle and walk back to the other person's car to "cuss them out". I personally think that is a very, very dangerous thing to do. Especially in today's society.