Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Skillet
Fingernails. It's uncharacteristic brutality both instrumentally and vocally, along with sympathy pain-inducing lyrics makes for Skillet's darkest and most disturbing work.
Never reaching what I want to reach
Never being who I want to be
Blaming me when I fall and fail
All my dreams splintering
Under my fingernails
Monster can be this as well, namely the version with the out-of-nowhere death growl. Lyrics about turning into some kind of uncontrollable creature and wanting nothing more than to be set free hits more than a few primal fear buttons...