Possessed Books
For $25 you can get these Possessed Books, which look like regular Victorian books but contain a motion detector so whenever somebody walks by the middle book will slide out. The books also emit "spooky sounds" which I imagine to be more comical than scary. If you really want to scare people, just hide in your bookshelf, and whenever somebody walks by jump out and punch them in the face.
Product Page [Thinks You Never Knew Existed]
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