Realistic details are intentionally added to an unrealistic design (or vice versa) to make it scary, either for characters or the audience.
- Dear God, that... thing is supposed to be an unabridged version?!
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/UncannyValley
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Realistic details are intentionally added to an unrealistic design (or vice versa) to make it scary, either for characters or the audience.