Nightmare Fuel / Magical Girl Lyrical Nanoha

• Episode 7, Precia's Cold-Blooded Torture against Fate. She has Fate chained up, and she's whipping the poor girl for not working hard enough. Note that it takes place almost entirely off screen. What we see instead is Arf in the next room over, desperately trying to block out the sounds of Preica's whip interspersed with Fate's screams of pain. Afterwards, we get a glimpse of Fate's face, and the poor girl is completely broken.
• Episode 8, Commander Lindy and Chrono's explanation of the true nature of the Lost Logia's. Lost Logia like the Jewel Seeds are dangerous artifacts of incredible power. Created in the ancient past by a lost civilization that destroyed itself, causing a cross-dimensional accident that brought about much suffering to many other worlds as well.
  Lindy: Within the dimensional universe, there are many, many worlds. Each world born onto its own, unique. On rare occasions, worlds are born that evolve too much too quickly. When the pressure of that evolution becomes too great. They tend to destroy themselves through technology and science. What's left in the aftermath are dangerous legacies of the lost worlds' technology.
  • Chrono adding that some Lost Logia have the power to not only destroy planets, but also the entire universe...