* 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...