What is the most dangerous thing you have done, that went horribly wrong?

When I was younger my friends and I would throw dangerous objects up in the air and try to dodge them. We used stuff like bowling pins, arrows, rocks, etc.

One day while playing we decided to use these hunting arrows(smart I know) that we stole from one of my friend's father, we went outside and decided today one of us were going to get on top of this hunting stand (not sure what they are called) and throw them at people. This went fine for a while, till my brother popped his head out one time and took an arrow across the neck. As a kid we all panicked because my brother was bleeding, so I piggybacked him home. Luckily when we got there and washed the wound it was barely a scratch.

The next day I decide to play again, but we decided that arrows were to dangerous so we decided to play with a sledgehammer instead. We tossed it up in the air and ran. We did this a few times, but one time I looked up and lost track of it, than quickly looked around to see where it landed on my head with the might of Thor. I stood there dumbfounded for a moment, and as I stood there blood slowly poured down my face(it really did remind me of the intro from Goldeneye). Anyways I started to scream and a random person I never met grabbed me and pulled me into their car and drove me home.

TL;DR- Brother got nicked in the neck with an arrow, I got my head smashed by a sledgehammer

Anyone with any similar stories?