well its all part of natural selection..

You see Tony take a large herd of animals say zebra.. The herd can only move as fast as the slowest animal.. So its these animals the slowest and weakest that the hunters target and kill. Thus allowing the herd to move faster and thus the herd evolves to a faster herd..
Same with nerve cells.. its the slowest and
weakest nerve cells the alcohol targets and kills first..
All natural selection. Which is why Tony your smarter when your drunk!