Funny you say that. New Years Eve 2005 we went out to one of those nice sit down dinners with all you can drink at a plush hotel. Everyone is drinking wine, beer, champagne, mixed drinks. The guy at our table is drinking cup after cup after cup of coffee. OK, fine, I thought. He doesn't drink, no problem.
Then I see him an hour later downing shots of Jack like it was water. By 2:30 am at the hotel bar, he was the most obnoxious drunk I have ever seen (and I've seen plenty).