I collect rocks, so yes. One time I scaled up a cliff about 60' or so to get to a certain layer. When I came back down I knocked out a loose rock and it destroyed my next foothold below. Not real great, as I was by myself. I estimate I was about 17feet off the ground at this point, and the ground below was not flat. It immediately went downhill at a 60degree angle for about 20foot into a raging creek that was flooding. I was there for a good 1/2hour before I worked up the nerve to jump. I hit the ground, tumbled, ended up in the creek and grabbed onto a big rock and pulled myself out. I know, it sounds like a Colonel Brag story. Happened about 10 years ago. What was weird is I felt fine, but by the time I got back to my car it was apparent I had a groin pull. To this day a certain area will bother me on rare occasion.
If I weighed then what I do now, were talking broken legs. At the least.