In heavy stop-and-go traffic, a cager made sure I wasn't able to split lanes between her. She moved all the way to the left, almost going into the next lane where another car was, just to make sure I'm stuck in traffic with the rest of them.
The car next to her spotted me, moved over a bit to give me a tight squeeze to fit through, and as I rode by, I punched the girl's sideview mirror. I want to say it broke off, but I'm not sure. If it didn't break, it definitely did get messed up.
Some of you might say that I was being an a-hole in that case, but if you had been there and witnessed this, I think you'd understand my frustration.