What stupid injury left a long lasting impact on you?
I'll start: I tried to move a bookshelf while drunk about 6 years ago and tore a tendon in my shoulder pretty damn good. It still bothers me sometimes if I move it wrong or sleep on it wrong.
I tried to stand on the very tip of my toes about a decade ago, since then I get these horrible toe cramps every time I move my toes a little too much.