This morning, I was on my regular commute, on a narrow, downhill section in the middle of the lane, when a car behind starts blasting its horn. I ignored it. At the start of the section, there is a sign showing a bicycle in the middle of the lane that says "BICYCLES SHARE LANE", so it wasn't like I was doing anything wrong. The car started really having horn diarrhea, so I sat up, started braking (as the last time I looked back due to a car horn, the car ahead of me stopped while I was looking backwards), and looked back to see what the motorist wanted to communicate. Instead, the white Prius went into the oncoming lane despite uphill traffic, and went around me. I caught up a stop light, and the young man in the Prius rolled down his passenger side window, gave me the finger, and said, "<something> go f uck yourself." So that's what he wanted to communicate. I resisted the urge to return the finger.