I once worked with a guy who had a couple of pints to 'loosen up' before gigs, then theorised that your body got rid of a unit per hour therefore, if you sipped slowly, it was impossible to get drunk. He also categorised tune by pints, a 'three pinter' being a more complex tune than a 'two pinter' etc. He was a lovely, clever, funny man who died far too young of liver failure. Like Duke Ellington said; 'It's OK to go to the party but you gotta know when to go home'.