Let's see...
Swan dives off the roof of my two story house onto a dirt pile..
My friends and I tossing fireworks at each other... like cherry bombs..
Taking model rocket engines, gluing fins to them and just putting a nose cone on them and lighting them...(You never knew what direction they would go)
Covering my arm with lighter fluid and then lighting it...
Riding my bike down the two story staircase from the back of my house...
Riding my bike down a huge pile of excavated dirt from a construction site with no brakes..
Trying to jump said bike off a 4 foot wall (and this was back in the 70's when bikes weren't meant to do that)...
..and there's a LOT MORE to this list.
Thankfully me and my friends never built that submarine out of old metal drums we had found (And we spent MONTHS working on the design for it. We could figure out how to make it go down, but not how to make it go up). If we had made the submarine, I or one of my friends wouldn't be here today because of course we had no concept of water pressure.
Yes.. I probably shouldn't be alive today.