My BFs grandpa tripped over a foot rest, hit his head, went into a coma and then died a week later, and he was by no means weak in any physical manner. Not saying that we all need to wear helmets when walking down the street or going to the grocery store and to be super paranoid about getting injured doing menial tasks, but if walking through the living room and tripping and hitting your head can lead to that, then riding a bike and falling over (which I would guess can happen more often than tripping in the living room and bonking your head pretty hard) could probably lead to the same conclusion. If I can prevent that just by doing something as simple as wearing a helmet, then that's what it'll be. As I said earlier, I've fallen hard twice and if it weren't for my helmet, I probably wouldn't be here.