Graeme Clifford's 1982 movie Frances starring Jessica Lange bothered me dare I say haunted me for months.
Although not a horror movie in the traditional sense it is horrifying that a person who is on the edge of "sanity" can be committed to a mental institution, shocked, drugged, debased, lobotomized and sodomized all for the sake of her "well being". What makes it even scarier is it actually happened to someone in the public spotlight.
There is one line in the movie where they are using her as a demonstration subject and the doctor says to a roomful of his colleges with great pride and glee..."and lobotomy get them home!"

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Sex is a tricky thing best left to professionals.