I'm of like mind with Christine on this subject. I've never been drunk, and if I've ever gotten a (short lived) buzz, I know it's time to stop. If I'm with people who I am comfortable having said buzz around, I try to keep as even keeled as I can possibly be considering the circumstances, though I know I can be a tad more giggly, humor driven, or into deeper discussion.
I'm not much for bars...if I do go to one, I'm usually getting an iced tea and a goofy look.