- Isolation, for a lot of people.
- The guests losing their sense of time. VAL reinforces this with her "Good morning/evening/afternoon" catchphrase.
- The guests slowly becoming demoralized and, in some cases, going mad.
- The video of intentional disturbing and demoralizing images. In the season 1 finale it's played on the walls of the cell the guests are locked in.
- The nail chair, the bed of nails, and the footbed of nails.
- The slowly shrinking cell in the season 1 finale.
- The final Treatment of Season 2 became literal Nightmare Fuel for Number 7, as he confessed in the reunion show.
- Season 3's deep-voiced, red, male VAL.
- The Season 3 finale's final treatment, involving electrocution.
- Season 4 has a head of nails with weights to press it onto your head.
- Season 4's final test involved a bomb.
- Some of the music can be pretty unnerving, like tracks with a Heartbeat Soundtrack.
- The endings to each season, where the winners are kept in Solitary permanently, as VAL has come to enjoy their company.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/Solitary
FollowingNightmare Fuel / Solitary
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