This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / V for Vendetta
Valerie's story. By the end of her tale, you will realize the full breadth of V's conviction that the Norsefire regime must pay, must fall!
Mitigated somewhat when Evie finds out that it was part of a Mind Screw by V.
Back in full force when V tells her that he didn't write the letter, but received it exactly as she did.
In the film, the flashbacks are this, especially after Valerie's lover Ruth was arrested. First, Valerie is seen hysterically sobbing, clutching one of Ruth's shirts. Then, when the police come for her, Valerie just sits there, staring straight ahead. She doesn't run away, or fight, or even scream... she just lets them come.
The letter ending with Valerie telling the reader, whoever they are, that she hopes they escape and live a happy life, and that she loves them, with all her heart. Even though Valerie never met V or Evey in person, you know that she really, truly means it. Evey herself is moved to tears by this, and kisses the letter after she reads that.
Also, the fate of the young girl in the movie version; during the VO by Detective Finch describing how "someone will do something stupid", it's shown that one of the Fingermen shot her for spray-painting V over a propaganda sign.
In the movie, V kneeling down and weeping after Evey's departure serves to humanize him beyond the faceless anarchist, and the small crack in his suave mask is hard to watch. Tearstorm ensues.
In the book, there's the part during Finch's LSD trip where he sees the smiling, laughing faces of all the people killed at Larkhill, and is filled with remorse for what the regime has done... and then they all run away and disappear...
In that same sequence, Finch pleads with Delia to help him as he's taken away to be executed, saying she's not like the others. Delia ignores him.
Delia Surridge's dignified demise:
Delia: Are you going to kill me now? V: (holds up syringe) I killed you ten minutes ago, while you slept. Delia: (fearfully) Is there any pain? V: No. Delia: Thank you. ... Is it meaningless to apologize? V: Never. Delia: I'm so sorry... (dies quietly)
V's death for some.
His last words to Evey's wish that she doesn't want him to die. "That's the most beautiful thing you could've given me."
If you look closely, all the dead are in the crowd at the end of the movie.
Everything about Gordon Dietrich in the film. He's a closeted gay man who takes in Evey at great personal risk, and is killed brutally, presumably after mocking the government on his show (Turns out they executed him on the spot for keeping a copy of the Qu'ran).
His capture is especially hard to watch. He instructs Evey to hide, so she gets under the bed, and is forced to watch as Gordon is beaten and dragged away, locking eyes with him as he falls to the floor... exactly like what happened to her parents. Gordon was the first person in a good long while Evey felt she could really trust, who really wanted to help her and even seemed to behave in a fatherly manner towards her, and Evey had to watch her protector be dragged away to certain death, again.