Best was one time I was riding home, and some teenagers in an old pickup passed me twice (within about two miles), each time with somebody screaming out the passenger window (and to be fair, they did give me lots of room, but they did startle me the first time!)

Well, the second time I saw they weren't going to make the light a couple hundred yards ahead, and I took off in pursuit. When I pulled up, I warmly greeted them. They rolled down the window, apologized, we chatted a bit, they cranked up the stereo so I could hear their tunes, and even offered me a drag of whatever it was that they were smoking that evening (I declined). They hadn't driven back to buzz me again, they said, they had just dropped off one of their buddies--and indeed, the first time they passed, there were three in the cab, and the second time, only two.