When I was younger, like 15 or so, I used to do really stupid shit all the time. And the day before christmas, I was fucking around with some friends and all the rooftops were covered in ice and like powder snow. So I grabbed the top of a dumpster and decided it would be fun to sled off the tops of some houses. So I went along, and did this for about 3-4 houses. Then my friends and I saw this massive ass house that was like 2, maybe three stories tall, and in their backyard whoever lived there had a pool. I bragged about how I would bet anyone 20 dollars that I could make it from the roof to the pool. I ended up falling through the roof of the house, saving myself, and then slipping and falling down into a frozen pool and proceeded to break several bones including my tailbone which still isn't even close to being healed.
TL;DR Went sledding off of rooftops, broke bones, still not healed. Not a good time.