What comes to mind? What movies/scenes resonated with you hours or days after you watched them?
"Cruising" is probably the most disturbing film I've ever seen.
Others just off the top of my head:
-Michael Imperioli's death in Dead Presidents
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Murphy's death at the beginning of Robocop...seriously, it's pretty ed tbh
-Marathon Man (you know the scenes)
-The Dentist
-The "Sloth" murder in Seven.
-Plenty of scenes from Blue Velvet
-Noodles raping Deborah in Once Upon a Time in America (not very graphic, but still shocking an unexpected).
Too many to remember...