Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Independence Day
Patricia: Is Mommy sleeping now ?
Whitmore: Yeah. Mommy's sleeping.
The look on Hiller's face when he finds out that the air base where his fiancee and stepson were headed has been destroyed. They're alive, but he doesn't know that, and they have a similar reaction when they think he's been killed.
The scene where Russel's teenage son overhears his dad's last message..... and not being able to say goodbye after all those times of thinking his dad was nothing but a loser.