Ah, I stand corrected re: screwball comedy, I always associated the term with... well, a more literal meaning. Like just another name for a wacky mainstream comedy without any specific theme (ie, not a spoof, not a stoner movie, etc) -- not a specific comedic subgenre. Interesting.
As for Shutter Island being an exercise in ambience.. I can see that, actually. It was clearly trying to be ambient, atmospheric.. it might have worked in a really nice theater, at least for a bit, but eh. It was just garbage. Just nothing to it.
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