Might as well share a similar story from a month ago.
A group of friends and I were headed to a fast food place in two separate cars. I was driving alone, following behind. I follow them into the parking lot when a giant white van pulls out of a parking spot to my left. I'm already in the parking lot and clearly have the right of way (he would have hit my tail had he continued).
He brakes suddenly as he realizes I'm there, and honks for a couple seconds. Absentmindedly, I flip him off and continue to my parking spot straight ahead. After parking, I hear an engine roar, and this guy has blocked me off from behind and starts screaming at me, "You flipped me off motherf***er!? I turn and look and since I'm trapped, with the windows closed, I just look at him like he's crazy.
After a few more seconds, he speeds off out of the parking lot, screeching tires at every turn. When he hits the main road by the restaurant, he yells out, "F*** you, asshole!"