A buffalo herd only moves as fast as the slowest buffalo. So those are the buffaloes that get picked off by wolves and mountaion lions and other predators. Of course, this is good for the buffalo herd which continuously improves their speed and fitness - by contunuously trimming off the bottom of the bell curve.
It is also well known that alcohol destroys brain cells - and that a brain can only think as fast as the slowest brain cells in it. Therefore, consuming alcohol is good for the brain as the slowest brain cells will get destroyed selectively, before the faster healthier cells - thereby improving brain performance overall for the consumer.
And that's why one always feels quite as bit smarter after consuming several beers.
