Aside from the usual terrible events that happen...

Seeing men break down the social walls and let loose a few tears always gets me.
Also, seeing children and spouses reunited with their moms and dads who have been serving over seas never fails to make me bawl. (Especially when you see soldiers crying. Or a dad who is just meeting his child because he was away...)I feel so warmed, angered, and cathartic all at once. It's amazing. *sniffles*