My buddy was an alcoholic. I remember he quit after his first DUI then started drinking every once in awhile a few months after he quit. When he drank he got fucking crazy and went overboard.
Well, he paid the price. One night he passed out behind the wheel with his foot on the accelerator, scraped 6 parked cars on the side of the street, went off the road and right into someone's living room.
He's got the "not a single drop" rule going for him now.
Me? I'm a full blown alcoholic on the weekends.