-People who double park right in the middle of the lane blocking all traffic when they could easily have double parked closer to the right so that cars could still pass.
-When someone swerves into the inner lane in a multi lane turn. There are a bunch of these double turns here is SF, and 90% of the time these idiots cannot make the turn without crossing the solid white into my lane.
Sometimes I wish I could just crash into the side of their car.