Actually, I've never had any serious injuries, so I had to make stuff up.
Well, once I fell off my bike as I was going over a stone I didn't see, and scraped my finger down to the bone. I was bleeding profusely, and didn't know what to do. I stumbled over to the nearest house and rang the bell. It turns out the woman who lived there happened to be a nurse, and was on her day off. I was mended up, but still have a small scar, almost 20 years later. Most of my other injuries were kitchen-related, when I first started working as a chef.