I nearly died as a teenager.
We used to build massive dens and bases in the woods/shrubland nearby - these were surrounded by large gravel pits and lakes, so inaccessible to anybody unless you knew a way through. A large canal also ran along one edge, where big cranes used to drop boats in. So there were lots of old used crane cables left lying around. One of the bases we made had a zip line strung between two big oak trees, a few hundred feet apart and about 30 feet off the ground, using one of the old cables. But remember, we're in a wooded shrubland, so there were lots of annoying small trees between the two, which we decided to cut down as much as we could. This inevitably left many spiky, foot-tall stumps of varying danger between the two oak trees. I had the honour of the maiden voyage on the zip line, which promptly snapped as I was half way along. I plummeted the 30 feet to the floor, towards the impaling spiky tree stumps, only to land starfished, with tree spikes impaling through the clothing on both my arms, my groin and my waist - but narrowly avoiding even scratching myself. If I'd have landed 1 foot to the left, right, in front of backwards, id have been a human skewer. We didn't make a zip line again.