When I was a kid I thought that his oddly shaped head was from boxing :rofl Unless he had some unusual dental injury that I am unaware of then I seriously doubt it.
Yeah I think it's genetic or something. His 'inability' to articulate a sentance in under an hour is completely deliberate though it seems.
I read parts of his autobiography. He learned how to speak that way and does it deliberately. Tried to sound posh for whatever reason...hence the funny way he dresses too.