One movie that totally freaked me out was "Amityville Horror" (the original one). I saw it in the theater back in the 1970's. At the time I was living with my brother and my room was in the basement. There was a semi finished bathroom below the stairs and the door was a piece of plywood on hinges. It looked the same as the room in the movie!
I absolutely couldn't go down to the basement after seeing that movie. And for weeks, actually months, I slept on the couch in the living room with all of the lights on. My brother or one of his kids had to go downstairs to get my clothes etc, because I just couldn't go down there.
To this day I can't watch that movie, and to this day basements freak me out. If a basement has open stairs without anything under it, that's ok, but if they are finished stairs and there is something built under the stairs, there is no way in heck you can get me down there shy of pushing me down the stairs.