As a horror writer, I can now confirm to you with evidence that anything can be horror. I just watched a man's face curl up in abject terror at the words 'Why Is It Still Outside My House?'
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Hoarders don't need stuff; they need to hold onto the ideas and feelings the stuff brings. She knows she doesn't need the box, but she needs the feeling of a family heirloom. If they have to steal it from a family member or a friend or anyone, they would.