stupid motorcyclists not wearing helmets who try to get into a "road rage style" race for lane position against an automobile
this was on a city street - a sort of major local street but one with one lane of traffic in either direction and a parking lane on the right (with signs saying "No Driving in Parking Lanes")and with cars sporadically parked along the way - FYI, the limit is 25 mph
I was at the front of 2 other cars, I was driving about 28-30 mph, approaching a red light a couple blocks ahead, when I notice in my side mirror a guy on a motorcycle coming up on the right, riding in the parking lane. He was trying to get in front of the guy in the car behind me, who was bound and determined not to let him in. We get to the light (it's red) and I'm in the left turn lane - the car that was behind me is next to me on my right, and the motorcyclist pulls up to his right (technically in the "right turn" lane)
Of course, the guy on the motorcycle was NOT turning right, he just wanted to get ahead of the guy next to me - as I'm sitting waiting to make my left turn, they both gun it and the motorcyclist gets ahead of the car, so the car gets into the right to pass the motorcyclist, who had to slow down because there was a guy ahead of him waiting to make a left turn. So I see the car pull ahead and in front of the guy turning left that was blocking the motorcyclist. At that point, I lost sight of them.
If you're gonna be STUPID that way on a motorcycle, at least wear a helmet.
(And it wasn't even a big motorcycle, it was actually more of a big motor scooter.)