I must be getting old, Tina. I couldn't get passed half way in that Scarred Youtube thing.
Is propensity to inflict serious self-harm relative to IQ, or self-perception? Thank the gods it's largely gender specific. Imagine if equal numbers of females headbutted walls too!
The only thing worse than falling ten feet onto concrete and realizing your forearm has a brand new "S" bend in it, would be then looking up to see the girl you were trying to impress walking away with an able-bodied chess player.