Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Shaun of the Dead
Shaun's tears as his mother dies.
Even worse than that was the moment where he breaks down in the Winchester basement. "I couldn't save any of them!" Just for a second he's way over the Despair Event Horizon, and he just thinks this caps off all the failures in his life...damn, Simon Pegg needs an award for that scene.
Liz: How many we got left?
Shaun: Two. S'pose we could take a few of 'em out if they stood in a line.