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Drunken fist isn't hard at all, well that it might be that i've been doing it for about a year now but still, and it's actually not possible when drunk, trust me I've researched it enough. Hardest thing about it is walking on your hands I can't do that yet. If you have any questions on the drunken fist PM i'd be glad to answer them.

Their is a style of Lee Drunken style. It is also in one of Jackie chains movie called drunken master (or something like that). Zui Quan (Traditional and Simplified Chinese: 醉拳; pinyin: Zuì Quán, literally Drunken Fist, also known as Drunken Boxing or Drunkard's Boxing) is a traditional Chinese martial art. It is a style of wushu that imitates a drunkard in its movements. The postures are created by momentum and weight of the body, and imitation is generally through staggering and certain type of fluidity in the movements. It is considered to be among the more difficult wushu styles to learn due to the need for powerful joints and fingers. Zui Quan is sometimes called Zuijiuquan (醉酒拳, literally "drunken alcohol fist"). From Wikipedia.

It was an old technique for monks actually...weird huh sweatdrop ninja

Interestingly enough, there are a few stories behind it(but no one knows which one is real). One is as old as a few thousand years B.C. and one seems pretty recent, maybe 15xx+.

If you want, you can read them all here: http://en.wikipedia.org/wiki/Zui_Quan#Origins