Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Ponyo on a Cliff by the Sea
While Ponyo on a Cliff by the Sea is in general a fun and happy movie, the part where Sosuke finds his mom's empty car and he starts crying tore this tropers heart out. Especially hard if you've ever lost a parent.
Sosuke's father's message: "I love you and I'm sorry." Reportedly, it was a message from Miyazaki himself to his family, as an apology for being away for so long while working.
From the Image Album, the final track "Himawari no Ie no Rondo." If you look up the translation, it's about the old ladies at the senior day care center wishing they could play again like children, or even just go for a walk one last time before they die.