It’s like this. A herd of buffalo can only move as fast as the slowest buffalo, and when the heard is hunted, well, it’s the slowest and the weakest ones that are killed first.
This natural selection is actually good for the herd as a whole because the general speed and health of the group keeps improving by the regular culling of its weakest members.
In much the same way, the human brain can only operate as fast as its slowest brain cells. As we all know, an excessive amount of alcohol kills brain cells, but naturally it attacks the slowest and the weakest brain cells first.
Thus, the regular consumption of alcohol eliminates the weaker brain cells, thus making the brain a faster and much more efficient machine.
And that is why you always feel smarter after a few drinks.