I've had more than my fair share though generally I try to just shrug it off since it doesn't really do any good to escalate. Some highlights though:

- Once riding past Fenway after a Red Sox game when some moron objected to my presence on the street. I don't remember exactly, but it involved honking and screaming and one of his passengers hanging out the side door. Now anyone who knows what traffic is like on Brookline Ave when a game lets out knows that I was the fastest thing out there that day so I caught up with this dude and had words. It ended with him shoving me and me telling him to go right ahead, let's do it, I had his plates anyhow. Then he got back in and drove off (sort of, you know, traffic and all) and I spit on his windshield.

- Another time I got passed WAY too close, so I came up on the dude at the light and knocked on his window. He rolled it down but apparently didn't appreciate me leaning on his fancy 325i because he started yelling and reaching around under his seat for a gun.

- Once I was being harassed by a couple of teenagers so when I passed them later and the passenger was hanging out the window hollering at me, I spit on his face. He actually got out and tried to chase me. It was so damn funny I slowed down and egged him on, dude probably ran 2 or 3 blocks.

- I was once hit by a transit bus because he pulled out to pass me without sufficient time before running into oncoming traffic, so then he tried to pull back in but I couldn't give way without running into parked cars. So he just merged right into my outstretched "stay back" hand. I came close but did not go down which was good because I was in front of the bus at that point.

- Once I had the extreme privilege of pulling over a Boston police officer. Really, you should try it sometime. He was tailgating and blasting his horn, so I got up on his left bumper and signalled him over. After explaining my rights under Massachusetts law he disagreed and pointed me to the outside foot of the full parking lane. We argued back and forth, he threatened to issue me a cite for violating a city ordinance (a bluff because there is no applicable ordinance). I asked him to, begged even. Then he changed his mind and threatened to cite me as a disorderly person for which there are no specific requirements. So I told him I would be on my way then but I woud be damned if I was going to give up my safe and lawful lane position.

- And then just Saturday I completely lost my cool. Some moron drove up on me as quickly as he could, then hammered his brakes what could only have been inches from my rear tire (I know because I saw the hood nose down in my peripheral vision while I was looking almost straight ahead) and slammed on the horn before eventually moving into the left lane to get around me. So I caught him at the next light and spit on his window, then the next light after that and pounded on the passenger window, and then in traffic after that and went to knock on the window again when he gunned the engine and swerved into me. Knocked my rear out of true but otherwise I stayed up. I realized almost too late that I had maybe taken it a little too far, so I cut my losses and took off (still making better time than that tool). I'm still not sure how I made it out of there because I was splitting a lane in heavy traffic. When he started coming at me, I know I recognized that there was someone to my right. Yet when I was knocked from my position, I found a path across the next lane (I do remember it was right on someone's bumper) and into the one to the right of that.

In general it's never a good plan to escalate with motorists, it's certainly not a good way to win friends or influence. I know some people who have very positive interactions when they go to explain the way things are. I truly envy them. Me, I just get heated, so I do my best not to get involved (despite the picture painted above).