Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Hamtaro Ham Ham Heartbreak
An in-universe example at the beginning. In the opening cut scene, Hamtaro dreams of Spat destroying relationships in Fun Land. Then, from Hamtaro's perspective, Spat charges toward him until his face fills the entire screen! Hamtaro flies into nothingness until he is woken up by Boss.
Many scary moments in Boo Manor, a mansion full of ghosts.