Hanging out with my cousin in Letchworth State Park at age 7 or 8 or something like that. There's a bit of snow on the ground, so we slide down a hill on our stomachs. Ended up splitting my head open on a rather large rock.
Boy Scout camp when I was 13 or so. My tent-mate brought food into our tent without my knowledge, and forgot to take it out before bed. I wake up in the middle of the night with a huge brown bear in the middle of our tent. He ended up grabbing my tent-mate's bag and walking out with it. Scared the **** out of me though.
Got some near-death experiences, but those were all from obvious risks.