Zui Quan (drunken boxing) is a chinese martial arts style that comes from Kung Fu (I believe). It imitates the movements of a drunkard, which is where the name comes from, often times making the practitioner look off-balance or even unaware. The theory here is that the opponent will not know where the practicioner's center of balance is and will not know where the practitioner is going to strike next, since he's swaying and stumbling like a drunk person. Its usability in modern combat is widely disputed.