I think you're all wrong regarding drunk scenes. The idea is that the person is inebriated and looking towards a camera is purely fluke. Pretending to be drunk is one of the easiest things to do. Don't forget that most of the actors/actresses out there have been paralytic more than once in their life time.
I think that I've been a little too quick to answer this question. Cheers Mamyalynne for making me realise. I'd like to retract what I said. If I was an actor I'd be good at playing the village drunk as my past kind of suits that; love scenes I'd be shocking at :/