In one epsiode of "Cheers", Cliff is seated at the bar describing the Buffalo¹ Theory to his buddy² Norm. Here it is, for your enjoyment³:

 

"Well, you see Norm, it's like this...

 

A herd⁴ 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 killing⁵ 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 intake⁶ 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."

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