Instead of writing my OSDC paper last night, I watched Grave of the Fireflies. I picked it up a few days ago to expand my collection of Studio Ghibli films. It's about two Japanese children during WWII.
It's a great movie, as I have come to expect from anything out of Studio Ghibli. The animation is fantastic, but you can see it come out in a different way in this one as opposed to the other greats like Princess Mononoke and Spirited Away; there's no magic or fantasy, so a lot of the mundane things get more attention. For example, the way a 4-year old girl cries about the death of loved ones.
It's literally the saddest movie I've ever seen. Similar to JML's hesitance to recommend Requiem for a Dream, I hesitate to recommend it to many: not because it's full of foul imagery and themes (although it does have its share of morbid stuff), but simply because the story is incredibly depressing. I was pretty well incapacitated after watching it, so I didn't finish up my OSDC paper. Even remembering some of its scenes is still now bringing a lump to my throat.
A good thing about its sadness is that it isn't purely about how some external force (e.g. drugs, war) causes strife for the protagonists, but also about their sometimes silly pride, bad decisions, or even bad timing. Oh well, I don't want to give anything away.
I guess I think everyone in the world should see it, but just make sure you're expecting some soul-crushing despair.