When the occasion calls for it.
Luckily, it doesn't take a lot to get me drunk, so it's a relatively cheap pastime. Give me six beers or a bottle of wine and I'll be happy for the night.
I used to have a tendency to overdo it and mix drinks, though. At a certain point during the night, I would invariably end up contemplating porcelain and hating myself.
Those days seem to have passed, fortunately.
Most disturbing part is, I'll be 19 in about a month. And I've been drinking since about 16.5. Somehow, I don't think that's good.