Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Sledge Hammer!
The killer's truly menacing adult form, and the mother's death, mostly due to how it goes completely silent as she's being pulverized. The opening credits, much like the ones in Violent Shit, also have a vaguely disturbing distortion effect added to them, resulting in something very surreal.