Lenny McLean was allegedly the best bare-knuckle fighter of the past 50 years. Here's him destroying someone (ironically in the ring) who headbutts him.
http://www.youtube.com/watch?v=XU6LEElJ15M
I think a set of PU's called 'The Guv'nors' is in order.
He held a mate of mine by his neck over the balcony in the 'Camden Palace' years ago and tried to put a racket on another friend of mines parents pub!
My Great Great Grandad was a bare knuckle fighter in a pub called 'The Old Mother Red Cap' in Camden. It's called The Worlds End Now, the huge one on the corner of Camden Road And Camden High St. They all had nick names back then and his name was 'The Bruiser Of Camden Town'.
I think I may have picked up some of his genes along the generations, like in resisting 800kg steel doors hitting me!!