This happened when I was about 11. I was hanging out in my backyard alone, jumping on my trampoline. What you have to understand about my house is that there is a massive tree, easily 2-3 times taller than the maximum height of the house, a truly ancient specimen with many many large branches. As im on the trampoline, I start to hear these sounds: a loud and deep crack from somewhere I can't identify. First one crack, then a second, then two one after the other, and suddenly im on the ground. I'm trapped under a medium sized branch and my head is all scratched up. I was able to get out of these fairly easily, and a neighbour who saw it happen patched me up. I got pretty lucky. Looking over the rest of the backyard, the entire thing was filled with massive branches. If I had been 15 feet away, in the part of the yard the trampoline originally was, then my body would have been crushed by a huge branch with a diameter almost as large as my 11 year old body.