The way I think about it is that the scariest stuff is stuff that you think could happen to you. What better place than in your own home. Just subtle things that creep you out; creaky floorboards, wind blowing, lights going out, moonlight shadows if done correctly these things can let your mind wander.
The scariest things are the things you never see, but think are there. Normally people always make stuff up to be much worse than it is.
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