I watched this on Jezebel and I'm almost inclined to believe that the teaser/spoilers in the trailer aren't quite what they seem. It really appears that the whole movie's plot is given away but that can't possibly be what was intended, right? I think that certain things are being shown one way which will turn out to be completely different. At least I'm hoping and assuming because trailers are never actually about the movie's real plot.
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"But I want you to remember, I intend this breast satirically." Susan from Coupling