Beauty is in the eye of the beer-holder. A formula built by researchers at the University of Manchester, UK, spits out a score ranking the drinkers' (mis)perception of beauty. The calculation factors in not only the the amount of booze consumed, but also the light conditions, the amount of smoke in the room, visual acuity, and distance from the person of interest.
BBC News online article
notes on evolutionary biology papers/programs and other stuff: a non-frequent approach