as a kid, at a family picnic, I took a length or rope, threw it around a branch, tied a loop in one end, & proceeded to demonstrate to a friend my genius way to climb a tree, meaning to pull on the loose end, with my foot in the loop. well. my foot went up as my head went crashing down
apparently I knew just enough about ropes to be dangerous.
meanwhile many years later a mountain/rock climber invented a device that lets one do something similar. FFWD to 3:36 for the mechanical ascender in action
View: https://youtu.be/u785RZPrM-c