there are only two films which i have ever turned into a crying sissy-boy during.

kiong cried during stewart little, finding nemo and indeed, bridget joneses diary.
there are numerous others, but these are the only ones i can remember off the top of my head.

the first film was the lion king. when simba's father was trampled by a stampede of antelope.
the second was earthlings. despite it's slightly tacky 10 min introduction.