As the youngest child of two psychologists, I most certainly am not making it up.
Sadly - I do not have any photos of me doing something innocuous while wearing a bicycle helmet, but here's what I got.
This be a shot of our back yard. You can see the monster sized Walnut tree to the left of, and above the sail boat. (It's kind of hard to miss... except when you're 6 years old and on a sled. Then it's not nearly hard enough to miss...)
This is me, circa 1990 I'd guess, wearing my big goofy helmet. Granted - I am sitting on a bike, but lets be honest, is it even possible to wipe out on a big wheel?
I'd say the reason I'm including this picture is because you can see the other big trees in our yard - but the real reason is because it's my favorite picture of my sister, Maggie, and I of all time.
If I do stumble across a picture of me in a bike helmet doing something that doesn't involve a bike (which I'm bound to at some point) I will make a point of getting it up here!