Evil Within (like the game with the same title).
I've always felt like there are two people living in my body, but it's just me. When my moods change my thoughts can get very dark and it is like I become a different person. If my life was a sci-fi movie and there was some experiment that caused me to literally separate into two people, one of them would be very timid and afraid of everything, but the other would be a violent psychopath and the movie would be rated R for sure.
That sounds like a very sad movie, but I imagine it would come with a badass soundtrack.
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