Haruhi Suzumiya/Fridge/Fridge/SuzumiyaHaruhi

Fridge Horror

 * The premise of Suzumiya Haruhi. At first glance the show looks like your regular high school comedy with an unusual element... until you realize the plot basically revolves around four people trying to keep a Jerkass God happy to prevent The End of the World as We Know It. So, they have to do anything she says and listen to her, including being sexually harassed, bossed around, and so on. Just one little temper tantrum, just one little argument with her love interest, heck, even just one stressful day, and the world is gone. And once you think about it a little bit more, you'll start to wonder what Haruhi is and is not responsible for, to put it simply. Overall, it becomes quite a darker story than you realize once you apply Fridge Logic.
 * The ending to Disappearance. Just think about what all the other main characters' lives would've been like had it gone the other way...