So a couple of friends and I were just goofing around celebrating a girl's birthday today and we were all taking exercise balls and ramming into eachother with them sumo style. Well two girls charge eachother and one goes flying back and smacks her head into a wooden cabinet. After running over there and lifting her head up she kinda started laughing, and we were like "oh at least your ok...". Then at that moment I saw the corner of her lip spasm and she blacked out for a second O.o;. Turns out she had cut her scalp and I'm pretty sure she had a bit of a concussion, so me and a girl were holding paper towels and an icepack to her head to stop the bleeding until the paramedics came and fortunately everyone was cool about it (a few of my friends can be a bit dramatic), and she ended up having a few staples put in which is better than it could've been. (She's fine now).
So anyway, what's the worst injury you've personally experienced someone have?