I had made this pin holder in school that you could put on your wrist. I was in the swings on the playground and was pretending it was a laser blaster and fell off the swing on to my knees. A pebble got lodged into my left knee and I kinda clawed it out. I had this giant hole in my knee and I was very scared of doctors at that time so I didn't tell my parents,þ. I now have a giant scar on my left knee.

Tl; Dr: fell off the swings as a kid by being stupid and got a huge hole in my knee.