There are various reasons why an individual might habitually consume large quantities of alcohol, but they all effectively boil down to the same thing. Five years ago, my business partner was a happy drunk. Three years later, he had become a moody drunk. And by the last summer, he was fumbling at the knob of the door to alcoholism. As with most habitual drinkers, he was nice-enough, regular-if-not-exactly-sharp kind of guy. He thought so too. That's why he drank. Because it seemed that with alcohol in his syste, he could more fully embody this idea of being that kind of guy.