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I went to see Parasite completely blind besides being aware (unavoidably) that there was a hard tonal shift at some point. I saw the poster and stuff, but that was it
the entire time I was bracing myself for it to shift into some sort of alien parasite psychological horror movie, which seems really presumptuous, except I saw Bong Joon-ho's The Host and that movie actually did have a giant monster in it, so I wasn't putting it past him