Re: It isn't that...it's something else !
'The shortest distance between two points is a straight line.'
You have to remember that we live on a giant ball, the shortest distance on the surface of a sphere is a great circle.
The sober one will walk a straight line which is a longer distance, the drunk will stagger with a bias towards the downhill, the drunk on average walks closer to the great circle and so covers less distance (as long as you don't count the backwards lurches)