Game that disturbed you the most?

[SanAndreasX]

DreamWeb, a game from 1992 by Empire Interactive. The plot was to kill seven people supposedly in a conspiracy to destroy the dreams of humanity, with lots of gruesome imagery. But by reading the diary included with the game as copy protection, it's unclear as to whether the "Dreamweb" plot is reality in the game's world or whether your character is just a serial killer acting on schizophrenic delusions. Admittedly, that plot point appears only in the paper documentation and not in the game itself. The game's ending has you being gunned down by the police. It also had a depressing, if well done, musical score.