gotta wear helmets
her indoors had a nasty bike crash a few years back, and ended up hitting her head on the ground, got a really nasty concussion amongst other things. if she'd not been wearing a helmet the injury would have been a hell of a lot more serious. i didn't wear one before that happened, and i've never been without one since
also, as gary pointed out, if you're in an accident and need to take it to court after, not having a helmet on (at the time of the accident, you probably don't need to wear one to court) will take the legs out from your case
her indoors had a nasty bike crash a few years back, and ended up hitting her head on the ground, got a really nasty concussion amongst other things. if she'd not been wearing a helmet the injury would have been a hell of a lot more serious. i didn't wear one before that happened, and i've never been without one since
also, as gary pointed out, if you're in an accident and need to take it to court after, not having a helmet on (at the time of the accident, you probably don't need to wear one to court) will take the legs out from your case