One thing I have noticed, is that bad drunks ALWAYS want to drink to excess. It's strange because, some people are happy drunks, and they'll just sorta drink a little, or drink a lot, just depends. Bad drunks though, the kind who get really mean and surly, they ALWAYS make sure to drink enough to get to the point that they're mean and surly. I never understood that, if alchol makes you mean and angry, why would you always want to drink a lot of it?