http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/WhenAKillerCalls
This is based on opinion. Please don't list it on a work's trope example list.
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Nightmare Fuel /
When a Killer Calls
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- The Hewitt children being murdered, and the torture scenes. Especially since the murderer was their father.
- The killer in general is a Nightmare Fuel Station Attendant.