This happened to me today.
I was heading west on West Federal Street. I was in the left lane next to the island plantings in the middle of the street. A car slightly ahead of me and to my right suddenly made a left turn in front of my car. I had to hit the brakes and blew my horn at the same time. The other driver was actually making an illegal U-turn. I was at a complete stop and looked at the other driver as she stuck her had out the window and then gave me the finger.
:o