Hmmm,trying to think if I had any head injuries when i was younger.
Well,the only thing that I can think of is when I had a go on my nephew's air rifle at his dad's farmhouse.
We were near a field at the time,and when I fired the air rifle the recoil was incredible.The scope on the rifle hit my forehead.I'm pretty sure I said a rude word at the time,but it did not bleed much.I looked a bit like Harry Potter with the forehead scar.I didn't expect the recoil to be so powerful.
Honestly,he could have warned me...doh!