Ok since it's a serious topic, let's be serious
Theory of the sheep :
A flock of sheep can not move faster than the speed of the slowest one.
When the herd is hunted, that is the slowest and weakest ones which are attacked first.
This natural selection is good for the herd in general, because the speed of the herd increases as the slowest and weakest are eliminated.
=================== SO ... =======================
Similarly, the human brain can only operate as fast as its slowest cells.
As we know today, the consumption of alcohol kills brain cells.
Of course it's the slowest and weakest cells which are destroyed first.
We can therefore conclude that the consumption of alcohol eliminates the weaker cells, making the brain more efficient.
===> Which is why you always feel a little smarter after 4 or 5 drinks.