Thought I'd share one of my favourites...

there are 'drunken boxing' forms. A friend of mine knows a little, and occaisionally when we spar he goes drunk. very disconcerting and unpredictable. He says that the purpose of drunken boxing, other than teaching relaxation, unorthodox balance, feignts and trickery, is to make an attacker underestimate you, to make them think they're attacking a helpless drunkard when in fact you're totally sober and capable. I'm told it doesn't actually work that well when drunk, but it makes a great theme for a martial arts movie to work better as such.