While visuals, music, and plot points can all play a role in evoking an unsettling mood, the words themselves are worth noting. Sometimes, anime characters say things that are just plain disturbing. The creepiest anime quotes have the power to make you shiver with fear and disgust.
These scary anime quotes often come from disturbing anime characters like Shou Tucker from Fullmetal Alchemist and Caster from Fate/Zero, but they can also be spoken by generally non-creepy heroes like Shinichi Izumi. No matter whose mouth they're coming out of, they will freak you out. Don't say that you weren't warned.