The Cries of Haruhi Suzumiya/Nightmare Fuel

You thought that the SOS Brigade could never be scary? Think again.

Kamigoroshi-hen, "God-Killing Chapter"
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 * Haruhi has her period in Hinamizawa. She also . She ends up
 * The scene where Haruhi considers before deciding . One of the options she considers is .
 * Kyon accidentally runs into  and almost disembowels himself, ultimately resulting Haruhi , do you think that's over? Not really.
 * Keiichi pays the SOS Brigade a visit, asking what happened to . After not getting a satisfying answer, he starts to  . Then the chapter ends up as the biggest Wham! Episode when Haruhi . Oh Crap.
 * It's mentioned that a corpse was found without a head. Guess who is responsible...
 * 's Barehanded Blade Block and gruesome result.
 * in general., gone completely insane, thinking that she is , and, being who she is,  It's even scarier than it sounds, because she's petty, egotistical, and she can  And the worst part?
 * In the last chapter, Nagato..., saying that it's the only way to clean up the situation. Made even worse because at that point, there is . It Gets Worse.
 * At the end,, with absolutely no rhyme or reason behind her appearance. It is either that or.
 * The very last, purely chilling, line of the first arc, WILL make you scream. Are you ready?

Tsukuribanashi-hen, "Made-up Stories Chapter"

 * Made worse throughout the story as we see
 * Kyon meets Haruhi coming down the road. She's acting emotionless, and tells Kyon that they are leaving the next day. Scary enough, but after that, we get to see what's causing her wierd mood: .
 * Nagato explicitly stated she has been, though whether she has started doing it, or had been doing it throughout the whole arc is unclear.
 * At the end of the "Retribution" chapter, this troper wanted to scream when Kyon began contemplating about and willing to
 * At the end of the "Retribution" chapter, this troper wanted to scream when Kyon began contemplating about and willing to