Mine would have to be either when I was a kid and cut my knee to the bone, (Yes for about thirty seconds you could see my kneecap before blood started rushing out from the sides of the cut.) or the time I broke my big toe all the way up into my foot, didn't go to the doctor, (Because they probably wouldn't do anything about it anyways or so I've heard.) and basically made it heal back up without being crooked by forcing a pair of wellington boots on every morning then wearing them all day. It was painful putting the boots on and taking them off. Think the opening scene from "Dances With Wolves." I just gritted my teeth and gave my boot a yank every morning. It was bad.
EDIT: I'm incredibly stubborn and my parents were trying to make me go to the hospital when I broke my toe, which I refused to do. I didn't want to wait 5-8 hours sitting in the lobby waiting for them to finally get around to me then say "oh there's nothing we can do Mr. Tapp, take these pain pills to take the edge off it." Screw that.
It's a big city that I live in and they have higher priorities than a broken toe, like stabbings and gunshot wounds. It pays to stay armed in my city. Especially if your car breaks down and you have to take the city transit system. If something happens, good luck getting help from the authorities!!!
EXAMPLE: Someone once "stumbled across" a dead body behind a Wal-Mart in a very dangerous neighborhood. It had been there for a really long time. When they got the body out of there (finally), they just disturbed the stench of the decomposition and you couldn't drive by that neighborhood without gagging. Here's the kicker...they found the body in a shopping cart and I don't know if the police took the cart as evidence or not (probably not because the police force in this grimy city embraces apathy.) which means there may be a cart that someone is pushing around, putting their groceries in...that had a corpse in it and all the decomp fluids all over it. It's still an unsolved murder.