Closest would probably when I hung myself from a noose over a stairwell and fully blacked out but the rope I used had so much stretch that I actually fell out of it, fell down the stairs and hit my head on a glass doorknob giving me amnesia. Probably would be dead if I wasn't an idiot about rope choice.

Other than that I mean I have had about 16 concussions and the one I got for accidentally skiing of a cliff and plummeting down below would be second, I'm lucky I didn't seriously injure myself other than the concussion and that people found me because I landed off to the side of another ski trail.