Logging is the second most dangerous occupation in America, and I know why.
I was cutting down a pine tree in North Carolina so my neighbor could get a view of the river. 95 foot white pine, 18 inch diameter. It was growing on a steep hill, probably 45 degree slope. The tree was leaning slightly uphill and I dropped it uphill. Hell I am from the flatlands of Georgia I didn't know any better. The tree dropped right where I wanted, and the butt was aimed straight downhill. I turned to mess with something on the saw, and suddenly the tree began to slide downhill like a sled. Got on top of me and crunched down right on top of my right knee. The trunk landed right on my knee and I was pinned.

Fire dept rescue squad had to come up and cut that tree off of me, carried me off the mountain in a Stokes basket.
Broke the big thigh bone, the femur, right in the knee. Did 18 months on crutches and wound up with total knee replacement. Damn knee still hurts, night and day.