These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Midnight Library
Paranoia Fuel: Almost every story contains a healthy dosage of paranoia fuel.
Is your babysitter acting strangely because she's moody or because she's been replaced with a doppelgänger? Is that little girl who's been hanging around you lately just lonely or is she hiding something more sinister? And do the people you're babysitting for not want you to check on the baby because they're afraid she'll wake up or are they really only using that as a coverup for something that's not quite natural?