I've numerous occasions where I've either rolled up beside someone at a light or in traffic and had a 'conversation' with them. A couple times I've got off my bike to discuss someone's manners. Followed people into gas stations, parking lots, etc. Usually most situations are resolved 'peacefully'.
2 situations stand out most in my mind.
1) Being tailgated hard on a residential street...I have cars maybe 4-5 lengths in front of me, a line of em, we're all doing 50ish, limit is 40. Cager is on my *** , I come to a stop sign, she semi stops, then starts trying to pass me at the stop. I continue on my way, a little quicker, she then passes me on the left (oncoming traffic lane), giving me the finger, screaming and ranting. 2 mins later, same line of cars is at a traffic light, so in essence she accomplished absolutely nothing except pissing me right off. I pulled up next to her window to ask what the hell her problem was, and I was met by just a complete barrage of profanities. I jawed at her a bit then just smashed her mirror with my fist, gave her one more single deuce, then tore out of there. The look on her face was worth it. Just utter shock, dumbfounded. Reaching for her phone but moving in slow motion.
2) Bunch of us riding on highway 7. Doing maybe 100-110 (80 zone). I'm in the right lane. Approaching an intersection (its green for me) and I see a minivan do a classic rolling - stop right turn, but really he BARELY slowed down. I had to brake HARD and dive to the left mid-intersection to avoid taking a back seat in his van. Slowed right down, let him pass until he exited and was stuck at a light. Parked my bike maybe 30 feet behind his van, dismounted and ran full speed towards his van. Flying superman punch ala UFC on the driver's side mirror. It disintegrated. Screamed "F you" at the completely stunned driver and his wife, jogged back to my bike and rode off.