Have you had one, two, three.....over the bar, struck by motorist, doored, something else. Was the helmet cracked? I guess it's not uncommon in the technical trail, mtb world, but how about among this crowd?
I've had two. Struck a dog flying down a hill on the drops, and last year, just cool passed out while riding. Doc said dehydration and too much bp med. Unconcious both times, no memory of the event. Helmet cracked both times.
One of the great things about cycling. Interesing stuff happens.