Not in the same league as most of the other responses but I cannot watch About a Boy. Yes the Hugh Grant film written by Richard Curtis. I’m not a big crier but that film is like a giant TEARS ON! Button for me.
I tried to watch it again last year as it’s one of my Wife’s faves and it was on already. I was in floods even before I’d sat down.
Something to do with the boy, his situation and the fact his only friends are adults kind of resonates with my childhood.