Don't really know... but one time I was leaning down to take off my shoes, when *WHAM* something hit me in the face. It did hurt, but not a lot. So I went upstairs (this was in school) the girl who (apparantly) did it by acciddent was like 'oh god sorry'. And then everyone was just staring at me. I'm like what's going on? Nothing hurt. Then I put my hand to my face, and it came back covered in blood. I looked in a nearby mirror. Blood was dripping down my face. I'm like 'Uhhh... Some help here please?' But it never hurt, so it was cool lol.