When I need to flush my sinuses, I listen to, or sing, certain songs.
Dolly Parton's I Will Always Love You is a surefire tearjerker for me, but I envisage it as the moment that a child opts to go into the care of social services and the mother gives it up willingly, in the knowledge that it's for the best, with the sentiments expressed by the song telling both sides of the moment of separation.
All the backstory of how that comes about aside, it's a heartbreaking moment.
There's another one that does it for me and even though I love it, I refuse to listen to it and thankfully, for me, I can't currently remember which it is
The whole parent-child separation thing tends to get me, including our relationships with animals. I generally try to avoid those tearjerker films because I'll blubber like a fool.
I went hysterical, as a kid, when I watched The Day Of The Dolphin. You'll know the moment when you watch it.