Yes, I have, and it became one of life's little lessons for me. When I was in my early twenties, I was driving east (in the Los Angeles area) on the 10 freeway, merging onto the 605 northbound. If you've ever been on this transition road, you know that it can be a little tricky during rush hours, and sometimes becomes one of those every man for himself situations. Anyway this car cut me off and forced me into the next lane, barely escaping what could have been a bad accident. Well I stepped on the gas and caught up to the guy. As soon as I was side by side with the driver, and before I got a clear picture of who was driving, I stuck out my middle finger. Instantly I regretted it. It was an old man and his wife, they looked to be in their eighties, or there abouts. He was waving an apology to me, and he had a sincere smile on his face. I saw his mouth turn downward, and a look of hurt on his wife's face and immediately felt like a king sized jerk, which I was. Life lesson learned? Don't be so quick to react or judge, and remember, we all make mistakes, big and small.