Discription of Events: Driver slammed on his brakes and made a fast UTurn to the other side of the street without slowing down or signaling nearly resulting in a collision. Fortunately I kept a safe distance between us and have quick reflexes but it was still very close. I asked what was wrong with him and he didn't seem to understand what he did was wrong. Then a female passenger got out and started rudley yelling at me. Awful, awful people.