Holy shit I just had the most generic horror movie dream of my family and friends slowly being replaced with shapeshifting aliens/monsters and no one notices except me and when I decided to warn the others it's already too late and I got killed and replaced too. And when I woke up, I still vaguely remembers the dream yet don't remember who's the one that got infected first in my family and then I wondered, how did I even dreamt of these events in the first place? I've never/rarely watch these type of movies 
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