What was your dumbest experience with another driver whether you witnessed it or were involved with it?

Just the other day I was at a red light. The light was changing to yellow for the other traffic and a mustang goes flying through the intersection. Next i hear some screeching and this guy with a mitsubishi eclipse had pulled up his emergency brake to stop before the red light. Well, he spun one and a half times and his jaw was wide open as he sat in the middle of the intersection. He then tried to get into gear and ground really bad... finally he drove off.