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.'