YMMV: The Infernal Affairs Trilogy

  • Moral Event Horizon: Hon Sam in the second film letting his Thai buddies massacre the non-active-gangster members of the Ngai family, including an old woman and a small child.
  • Nightmare Fuel: Hong Kong is implied to be Hell from the blurbs at the first and ending parts of all three films. Essentially, all of the characters are trapped in this continuous hell and forced to suffer for all eternity.