Yep. It was before I had the bike rack, so it was a little less obvious that I was stopping to offer him a ride to the LBS. I think the only thing I could have done to scare him more would have been to roll up behind him with my spotter lights on and hit the airhorn.

cccorlew mentioned drivers with horse trailers giving plenty of room, and I notice that around here, too. I don't know if it's based on equestrian understanding of being a vulnerable road user, or if it's just because they're safety conscious about their humongous trailers and actually understand how much space they take up on the road. Either way, I've never gotten less than 1/2 a lane of clearance from one.