In one episode of 'Cheers', Cliff is seated at the bar describing the
Buffalo Theory to his buddy, Norm. I don't think I've ever heard the
concept explained any better than this . .
'Well you see, Norm, it's like this . . . A herd of buffalo can only move
as fast as the slowest buffalo. And when the herd is hunted, it is the
slowest and weakest ones at the back that are killed first. This natural
selection is good for the herd as a whole, because the general speed
and health of the whole group keeps improving by the regular killing
of the weakest members.
In much the same way, the human brain can only operate as fast as
the slowest brain cells. Now, as we know, excessive intake of alcohol
kills brain cells. But naturally, it attacks the slowest and weakest brain
cells first. In this way, regular consumption of beer eliminates
the weaker brain cells, making the brain a faster and more efficient
machine. And that, Norm, is why you always feel smarter after a
few beers.'