When I was a kid, I had an extension latter leaned up against a tree. I was near the top. The legs lost traction on the grass and slid away from the tree while the top rung slid down the tree right in front of my eyes. I accelerated rapidly in a negative vertical direction. When the ladder hit the grass, I was laid out on top of it. Those rungs bent me into a pretzel. Amazingly, I walked away - after I caught my breath.
