Gonna be honest, I usually make my backstory like 2 or 3 sessions in, that way I get a feel for the character and can do something that makes sense. I usually start off with a rough idea, but I like incorporating themes from the story into my background
I'm pretty sure a doctor did this to me when I dislocated my shoulder (or at least something similar). It very much hurt in the moment, but right afterwards the pain disappeared, it was truly a strange experience
"You'll be bought by a texan plumber to use as a business vehicle, only to be later sold and somehow end up in the middle east helping isis with Mark's Plumbing still written on the side and a heavy machine gun mounted to the rear"
Animal is my favorite Muppet