>
> A herd of buffalo can move only 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 culling of the weakest members.
>
> In much the same way the human brain can only operate as fast as the
> slowest brain cells. Excessive intake of alcohol, we all know, 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.
>
> That's why you always feel smarter after a few beers!