I have this scar on my right ankle from when I was a camp counselor at a summer camp where we took 8-10yr olds into creeks to explore.
Some kid decided he wanted to be a body builder and try and pick up the heaviest rock he could find. He then proceeded to come up behind me, get my attention, and decide it was too heavy for him.
This equates to a nice handy dandy scar from where the rock ran down my leg