I don't think this qualifies as SS, but as it's an ongoing irritation, I'll post it here.
People who block parking garage exits in heavy traffic. I was trying to pull out of the parking garage at the hospital this evening. It was rush hour traffic and the hospital is smooched between two major expressways. The back up along this particular stretch of road is pretty bad going in one direction towards expressway A. While expressway A is my preferred route home, given the time of day, I decided to take expressway B. This meant I needed to turn left out of the garage (turning right would take me to expressway A). So, there I am, turn signal on, wanting to turn left. When I first approached the exit, it was blocked, but cars started to move a little bit. Then this woman in a little red car looked right at me and pulled ahead, blocking the exit (as if to prevent me or anybody else from turning right). The trouble is that at least three cars (me and the two behind me) wanted to turn left. We had to wait almost 10 minutes for enough traffic to move so that she could clear the garage exit. I don't even want to know how bad the back up inside the garage was, since there's only one exit, and it was shift change.
Thankfully, the person behind her wasn't such a jerk. I motioned to her that I wanted to turn left, and she waited while I and the two cars behind me turned out of the garage.