Oh-ho-ho... the stories that I could tell.
*Robocop: The scene where Alex Murphy (Peter Weller) is brutally tortured via shotgun blasts by Clarence Boddicker's gang. The subsequent scene in the ER where the doctors try to resuscitate him as his life flashes before his eyes is just as tough.
*The Breakfast Club: Granted, this is an unusual choice for a list of films that disturb me, but underneath it's exterior, this has got to be one of the bleakest, harshest, and most cynical portrayals of teen life outside of dystopian science fiction. And I lived it. Arguably the Neon Genesis Evangelion of John Hughes films.
*Juno: The potential relationship between the titular character's son and his adoptive mother Vanessa (Jennifer Garner), when looked at in a particularly bleak frame of mind.
*The Shining. Do I really need to go into detail?
*A lot of movies made by Lars Von Trier, Todd Solondz, Larry Clark, Harmony Korine, and so on, which seem to relish in unadulterated nihilism and misanthropy.
*Cannibal Holocaust.
*A Serbian Film. Two words: newborn porn.
*The antics of the Dnepropetrovsk maniacs. http://en.wikipedia.org/wiki/Dnepropetrovsk_maniacs
*Teenage thrill-killer Alyssa Bustamante. http://i.cdn.turner.com/trutv/trutv.com ... e-2-fb.jpg
*Men Behind the Sun: The child's vivisection, the cat being torn apart be rats, the skin peeling... Hell, the whole movie.
*Tenebre: Many of the killings.
*Deep Red: The scene where a woman is burned with scalding hot bathwater by the killer. Also, the killer's death.
*The ending of John Frankenheimer's Seconds. The character of the Old Man is a class of Nightmare Fuel in and of himself.
*Richard Allen Davis. http://en.wikipedia.org/wiki/Richard_Allen_Davis
*Joel Steinberg. http://en.wikipedia.org/wiki/Joel_Steinberg
*Manhunter: The scene where Graham (William Petersen) goes to the Leeds house for the first time.
*September 11, 2001.
*The Sandy Hook massacre.
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Yes, I'm still alive.