Let me tell you, I feel like wearing my Giro Atmos all the time around my friend. I was loading my bike into his car and he starts closing the hatch and clunk - closes it right on my head!!!
I had my helmet on, fortunately and it had a nice dent in it; better it than my head.
Really lightweight helmets are the best way to survive - the trick is to just leave it on all the time - you can't know when the unexpected will happen.