So there's Gestalt the way it's meant, as in the spirit of something, its essence or the sum of the parts.

Then there's Gestalt as in ghost, as in scary thing that frightens little children and teenagers who go to horror films.

I've never heard the word used with that 2nd meaning. I consulted two dictionaries, and neither offered that meaning.

My New Oxford American dictionary offers this: "an organized whole that is perceived as more than the sum of its parts."

And Merriam-Webster online has this: "a structure, configuration, or pattern of physical, biological, or psychological phenomena so integrated as to constitute a functional unit with properties not derivable by summation of its parts"