How 'bout that opening sequence, eh?
The rest of the movie is such a shock that everyone wants to talk about the sex or the abortion or the ending or Shia Labeouf. Either that or gloating their disapproval of the film over how little they understand it. But has anyone talked about the opening here? 'Cause I'd like to interject.
1. It's obviously a tribute to Andrei Tarkovsky. Much like Solaris' opening with shots of nature that the main character, who will go up into space on a potentially dangerous mission, may never see again.
2. How I interpret the beginning, and stop me if I'm wrong: It's about nature and what sounds nature makes in modern society. We hear squeaking of the fan, rain on a trashcan, wind on the little bolts on the circle thing. (shut up). Are these sounds pleasant to our ears or are they annoying? This is very much like Joe's situation. Her sexual drive, a product of her born nature, is taken as a nuisance in society. And on top of that the dripping of water symbolizing female lubrication, and the air vent (the vagina) and the unseen depths it can lead to.
3. The industrial German metal blasting right after is just kick ass!