I nearly saw a non-driven van in an accident a few minutes ago.
I was walking to work (I'm on a computer at work now) up a road with a gentle gradient, when I saw a white van coming towards me, with two blokes, one on either side, running alongside, hanging on to the door handles. For a minute, I thought the van was being stolen, but then realised that it had no driver - the hand-brake must have slipped off. The bloke on the pavement side let go of his handle to go round the front and push (rather dangerous, I'd've thought), so I took his place on the handle, and we managed to stop it just before it rolled out into traffic on a busy road at a T-junction. Not a word of thanks did I get, but it's possible they hadn't even noticed me.