And the disequilibrium:
Scientists believe they have worked out a formula to calculate how "beer goggles" affect a drinker's vision.
The drink-fuelled phenomenon is said to transform supposedly "ugly" people into beauties - until the morning after.
Researchers at Manchester University say while beauty is in the eye of the beer-holder, the amount of alcohol consumed is not the only factor.
Additional factors include the level of light in the pub or club, the drinker's own eyesight and the room's smokiness.
The distance between two people is also a factor.
They all add up to make the aesthetically-challenged more attractive, according to the formula.
A poll showed that 68% of people had regretted giving their phone number to someone to whom they later realised they were not attracted.