The one movie monster that scared me when I was a kid wasn't really ever present on the screen, so much as he was vicariously present through a medium: the demon that possessed Regan in The Exorcist. That motherfucker gave me countless nightmares up until I was 7 years old and it was just the KNOWLEDGE, not FEAR, that it could happen to me. How did I KNOW it COULD happen? Because I was probably 5 or 6 when I watched it and if you're raised to believe this nonsense, impossible things seem pretty believable. Catholic school rapes young minds like priests fucking altar boys, man.
Jam it back in, in the dark.