It totally caught me off guard today, since most motorists around here are courteous, and the few negative encounters I've had were with people who were mostly clueless and not intentionally reckless. But today, a driver was so horribly inconvenienced by having to move over to pass me, that he aggressively tapped his horn, passed way too close, and continued blaring his horn after the pass was completed. The occupants of the car were two teenage boys, neither of whom would meet my gaze as they passed. But I could tell the driver was eyeing me in his rearview mirror, because after he had passed he extended his arm out the window to flip me the bird. I returned my own bird. This lasted all the way until he disappeared over the crest of the hill we were climbing. I really wanted to meet him at the light I knew was at the bottom of the hill, to ask him politely what that was all about. But he got the green before I could reach him.
Initially, it pissed me off, but it didn't take long before I started laughing at how ridiculous the whole thing was. What exactly was he communicating? Does he do this to all slower-moving vehicles he has to pass? Farmers driving tractors? Large trucks laboring up a hill? Amish horse and buggy?