I once got challenged by my brother to climb a big ass tree, just for me to fall and break one of my ribs. I was 3 - 4. (The tree was big at that age)
I once punched myself the hardest I could in the face by accident which made me get a huge nose bleed.
My friend once told me to let go of the ladder when I was pretty high up. I did it.
Oh! And once I was gonna be "tough" infront of my friends, and tried killing a snail by jumping on it, I failed horribly and hit a fucking log (yes, a fucking log) which broke my jaw and nose, luckily, it only like broke a baby tooth.
I once slammed my friends head into a glass window during a fake fight which made him lose half of his tooth, this time, it wasn't a baby tooth..
I also once thought it would be funny to throw a thick stick at one of my friends who were sitting down. I made his head bleed and he had to glue it.. He still dosen't know it was me to this day.
Oh, childhood.. Brings a tear to my eye..