The Absolute Best (to my knowledge)

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  NIGEB Nigeb. Go back. Go back. Nigeb. *Judge's top choice in Equestria Daily's 2012 Nightmare Night contest* by Aquaman 9,777 words · 348 · 18
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  A Night at Shadow Station Trapped in a haunted train station, Fluttershy must find a way to survive the horrors that lurk its ancient halls. by MrNelg 40,425 words · 182 · 3
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  Holder's Boulder "Mind thy work. Honor thy kin. Stay away from Holder's Boulder." Marble disobeyed the warnings. by Horse Voice 5,082 words · 510 · 12
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  Johnny Never Knew What Hit Him Am I dead? No. I can feel my limbs. Have I been captured? Oh God—there's something attached to my spine! by Horse Voice 7,436 words · 371 · 25