well helmets may be of not huge use on the road, but they saved my head today, getting the bikes out the shed, the three bikes ganged up on me and tripped me over, basically by all coming out the shed at the same time. fortunately the end of the handlebar of my road bike broke my fall by jamming into my chest whilst my mountain bike went for my knee and got it with a peddle whilst my wifes bike sneekyist of all gave me something to grab onto only to slide away giving zero support, my head (in helmet) spent its time crunching down the edge of the door jamb - which if I had been helmetless would have been very painfully, possibly bloody and full of splinters.
having finally got disentangled, got on my bike and went on my normal off road route, nice farmers had cut the hedges, loggers had logged out the really bad bit with the fire trees so it was lovely , almost like cycling along an open road but there was possibly less potholes.
right now of course I'm feeling a right tit - but thats because its quietly going purple. and unfortunately my blasted helmet saved me from a head injury (ablit probably superficial) to distract me.