Buffalo theroy of Beer
A herd of buffalo can only move as fast as the slowest buffalo. 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 herd keeps improving by the regular killing of it's weakest members!
In much the same way, the human brain can only operate as fast as the slowest brain cells. Excessive intake of alcohol, as we know, kills brain cells. But we know the alcohol attacks the weakest and slowest brain cells first....which means that regular and excessive alcohol consumption eliminates the weaker cells and leaves the brain to be a faster and more efficient machine! That is why you always feel smarter after a few beers!