Laconic / Fridge Horror

When something logical becomes horrific after someone realizes some creepy stuff of the simple fact. Especially if it's hard to notice it, at first. Unintentionally or not.
Visit unabridged version HERE... Oh no! If only I knew it's unabridged horror!

http://tvtropes.org/pmwiki/pmwiki.php/Laconic/FridgeHorror