I'm generally pretty mellow both on my bike and when driving a car (which doesn't happen very often).
ALTHOUGH...
Yesterday while riding with my gf some dude in a convertible passed me and yelled that I was an a-hole for riding in the road (I was taking the lane--it was a two lane street with a full parking lane on the right. I was riding in the center of the right lane).
So I get in the big ring and chase the car. Unfortunately for him traffic is moving at 25 or so and it's easy to catch up. I ride behind him and basically throw a tantrum for about 5 minutes, yelling "WHERE THE **** SHOULD I RIDE, *******!" <he points at the FULL parking lane and says:> "Have some common sense!" I yell back "THERE ARE ****ING CARS PARKED THERE!" and so on and so forth until he is able to get onto the on-ramp to I35 where I can't follow. As he is turning I pass him in my lane and make like I'm going to spit

As soon as I did that I realized I needed to get a grip, so I pulled over and just took a moment to breathe.
I really embarrassed myself and left my gf behind at the library where we were originally headed.