Road Rage and Coffee, Who Knew?

Although I must admit I have experienced some road rage of my own, I have never experienced this.  I was driving along Van Winkle which was under construction and down to one lane.  I was behind a big rig and we were going about 15 mph.  Finally, we passed the construction zone and it opened back up to two lanes.  As soon as it did, I got into the left lane and increased  my speed.  Well, the Big Rig found himself behind another large truck and decided he wanted to move over too.  I was almost past him when he began to move over.  He could clearly see me.  How does that sticker go?  "If you can't see my mirror then I can't see you."  Well I could definitely see his mirror.  I quickly sped up so as not to be pushed off the road.  Apparently this was the wrong thing to do.  When we got to the stop light he leaned out his window and began cussing me out and giving me the finger.  I just put my hands up and shrugged my shoulders at him.  Apparently again the wrong thing to do.  As I waited to turn left at the next light, I was startled as something hit my car and brown liquid began to run down the window.  By the time I realized what had happened, he had driven away and I was too late at getting his license plate.  He threw his coffee at my car!   Seriously?  What has this world come to?