This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Carpe Jugulum
Mightily Oates burns his holy book to save a life. Just very powerfully written.
Made all the more powerful because he does it with little hesitation, in a manner that says, "I can't think of a better use for this."
Granny Weatherwax is called to help at a difficult birth when the midwife cannot cope. She ends up having to make a decision whether to save the child's life or the mother's. After she makes her choice the midwife says she should have asked the father/husband to make the decision. Granny's answer: "What has he ever done to me that I should hurt him so?"
Simply seeing Granny Weatherwax of all people suffering debilitating weakness is heart-wrenching.