One night at Cheers*, Cliff Clavin said to his buddy, Norm Peterson:
Excessive intake of alcohol, as we know, 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! That’s why you always feel smarter after a few beers.
* Cheers was a long running American sitcom set in a bar in Boston.