When I was a toddler, I was climbing on the back of a chair and I fell and hit my chin on it, biting my tongue really hard. It left a pretty deep gash that I can actually feel. Also, a couple of years ago I was standing near my dog when something startled her, and she jumped back and dug one of her toes into my foot. There was loads of blood, but it didn't really hurt much, and now I have a cool inch-long scar there.