This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Demon Knight
Poor Cordelia, and how The Collector can easily convince her to join him.
The Collector: Poor Cordelia. Seems downright criminal to treat such a pretty girl that way... did I say pretty? I meant beautiful; 'cause you are, you are beautiful Cordelia, Inside and out. Maybe nobody here can see it, but I sure can. I understand you: I know what you want, I know what you need. Guys like Roach, they think just 'cause they're paying for it, that they can treat you like shit, and spend the same money on dinner and a movie they can call you girlfriend instead of whore. Whore; what a horrible word that is to use on someone who's really just a sad girl who's looking for love. Tender, warm, unconditional Love. I can give you that love, as much as you take. All you have to do is let me in, let me in, let me in, let me in, let me in.
The Deputy sits quietly, mourning his boss' death for a good long while before the group gently tell him it's time to get out.