This is a very fuzzy memory.

But it's one I've always had. It seems more like a dream now than something that actually happened. But I do believe it actually occurred. When I was around age 4 or 5, I guess it would have been, I seem to recall a group of us kids around that age were on the first floor of a new house that was just starting to be built in our neighorhood. We were standing in a group. And someone said everyone should back up to form a circle. In doing so, I fell backwards through the open stairwell into the basement. The floor of the basement was dirt I believe. No stairs had been built yet. There was a ladder down into the basement.
I don't know if I was unconscious for any period of time. But, at some point, I climbed up the ladder. I have this memory of one of the other kids saying something like: "How are we going to get him out of there?"

But when I reached the top of the ladder, I guess I simply stepped off onto the floor of the structure. At that point, I walked home and sat on the front porch of the house where we lived. (I think it was possibly a duplex where my parents rented. I know they never owned a home there. I doubt the porch I sat on was even our porch.) I guess one of the other kids went & told my mother what had happened because she came out to see if I was okay. I guess she must have decided I was because, so far as I can recall, I wasn't taken to the doctor.