Only three times. First time taxi cut me off as he swerved into the bike lane forcing me to swerve into another lane. Another cyclist saw this yelled at him and he yelled at out with such a thick accent I couldn't understand him. He got the bird. Second time was during this incident. I've been good since then. But a couple weeks ago a guy in a minivan with reggae blaring out of it pushed me over the edge. I was in the middle of sharrows on a two lane one way avenue. This guy gets right behind me tail gates me honks a few times realizes I'm not going to give him the lane. So he decides to split the two lanes and passes mere inches from me and then proceeds to slow down so yeah he got a **** you and the finger. Sometimes people just deserve the finger but I try to be reserved with it.