I was riding a bike and racing with my friends, so we were going very fast. And then suddenly, I hit something. I dunno was it a rock or a plank, just that my front wheel turned for a 90 degrees within half a second. So I just dived into the air, fell onto a concrete, and traveled another 2 meters, leading with my chin, 2 elbows, and 2 knees. My elbows and knees had no skin left and you could easily see some flesh. But my chin was mostly damaged. I've had a hole in it, and as I stood up, I've seen pieces of my own flesh lying on the floor.
I couldn't move my arms or legs for weeks, and I've got one stich on my chin. It was kinda plastidc operation to shorten my chin.