I just absolutely do not understand how that is even possible. If I have ONE beer, it throws off my ability to write good code, or hold all of the concepts in my head.
One of the weekly coworking meetups I go to always ends at a brewery (there is a brewery next door to the hackerspace where it is held), and while it is certainly a lot of fun being there brainstorming things, I don't understand how anybody gets actual code written after drinking.