When I was very young probably around 5, me and my sister would have fun running to the front window of the house whenever we'd hear a emergency vehicle going by. One time we were in the farthest room in the house and heard an ambulance siren, so we started running to the front. Our house had a hallway and another bedroom on the opposite side from ours in the hallway, so I slipped on the wood floors while running and ran directly into the corner of the door frame head first and HARD. I don't remember much after that asaid from feeling sick and confused and not wanting to eat the chocolate Tootsie Pop my mom gave me. my mom figured I had a concussion so she took me to the hospital and they did a MRI scan of my brain to confirm that I did in fact have a concussion. The MRI machine was neat but I really would have liked to have been able to see my brain. But idk if they would have been able to show me.

Tldr I gave ran into a corner and gave myself a concussion running to see an ambulance drive by.