Sounds familiar. My concussion stories:
5 or 6 years old, just learned to ride a bike. Riding down our street when something made me look back behind me, then things went blank. Turns out when I was looking backwards, I ran into a parked car. I was out cold, neighbor carried me home.
Age 15 or 16, playing touch football in the street. Ran a play as a receiver and hit my head on the pavement. Went back to the huddle, then just wandered back to the backyard, where I proceeded to pick a carrot from the garden I had planted. Needless to say, the game ended at that point.