Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Kyoryu Sentai Zyuranger
Those who fail to answer Dora Sphinx's riddles correctly are trapped inside trees that are about to be cut down. Unseen and unheard, they can do nothing but scream as the tree they're in is being cut down.
Dora Goblin eating the souls of children
Dora Boogaranan swallowing Geki and Dan whole.
Bandora bleeding from her eyes while casting the spell to summon Dai Satan.
The moment in Zombie Franke's transformation into Satan Franke where his skull splits in half.