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
heard is hunted, it is the lowest 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."

Hic...

Corey