...by a bendy bus. It was being reversed out of the depot, and I don't think the driver had reversed an articulated vehicle before. His (or it might have been a she actually) banksman had stopped the traffic for him/her, so we all had a great view as he/she backed a bit, realised the bus was jack knifing, pulled forward a little, backed again, on the same lock, so the bus started to jack knife, so forward again, and back, on the same lock again.... The temptation to jump of my bike shouting, "for god's sake, right hand down, let ME do it", was quite strong. When I eventually snuck past, the traffic the other way was backing up nicely.... Shouldn't laugh, I guess I've been there myself with a trailer, but really, if one way doesn't work, don't just repeat it over and over!