They didn't speak to me, but I had a strange encounter the other night.
I was riding alone up an overpass at about 2AM, no cars or people in sight. A car passes me slowly, some guys look at me, then they accelerate again. When I'm approaching the top, I see the car stopped there as if waiting for me. It looked like they were up to no good, but if I turned or stopped they could catch me anyway, so I go on. As I pass, someone opens the rear door and sticks out a hand with something in it. He throws me a stream of that white carnival foam (and misses). Not a word, a laugh, nothing. They start and pass me again, don't even look at me.
Sort of anticlimactic, but I liked it better that way.