These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Paths of Glory
Moral Event Horizon: Mireau crosses it when he orders his artillery to fire on B company in order to force them out of the trenches.
Tear Jerker: The ending. A young German woman is forced to sing for the soldiers in a tavern. They are are cat-calling, hooting, and laughing at her. Then she starts to sing a simple, well-known ballad about love in war, "The Faithful Soldier". The audience quiets down, and they start to hum the song along with her, as they recall their youth, their homes, and their loves in a world they may never see again.