So, you just reminded me of when I tried to show my Dad, at 4, how I knew how to ride my bike!
Note: I dont really have memory of this, but the story has been told and I've seen the pictures of the aftermath.
I was 4, and the townhouses we lived in had those big concrete steps up from the sidewalk, with little cobbles between each house. My Dad gets home from work or school, and in my excitement I tell him I've learned to ride a bike. He say's oh thats great!
He then proceeds to accelerate me well beyond what my little legs could do myself, and I go face first, and remember kids we didnt have helmets in the old days, right into the concrete steps. I've never seen a better set of black eyes.