Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: John Carter
As he's fighting off an entire army of Warhoons, flashbacks show John finding his home destroyed and his wife and daughter dead. The subsequent cuts of him burying his family paired with Michael Giacchino's score during this scene will guarantee you reaching for the tissue box.
The near-Downer Ending where a Thern uses tech to send him back to Earth after he threw away his own teleporter after deciding to stay on Mars. There was also his joy at returning to Mars in the end.
The scene where John accidentally kills a Thark and he and Sola are branded. Sola already has brandings and next branding will kill her. She looks at John like she was contemplating if her keeping him was worth it. He's never seen apologizing on screen.
Coronel Powell, the Cavalry officer whom's life John saved and in return warned him of his incoming attacker back on earth? He died alone.