Couple of friends were over once when I was like 15 and we were having a general battle as you do with your mates, just roughing each other up a bit. Anyway one of them thought it would be a bright idea to lob this giant paperback book at me and Jon who I had in a headlock at the time, and the corner smashed straight into my forehead and bust me wide open. I donned the proverbial "crimson mask", it was epic. Entire face was just covered in blood, and because our phone wasn't working at the time, I just went and knocked next door and asked casually asked them if I could use their phone. Suffice to say, they were a bit disturbed.