http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/TheGirlFromWhirlpool
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Nightmare Fuel /
The Girl From Whirlpool
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Spoilers below:
- Orochimaru's lab, specifically the secret underground chamber where he takes his kidnapped victims to experiment on.
- What Orochimaru does to Minato in chapter 26.