I almost teared up a bit while watching Wall-E, at a bunch of parts.
Also there's a part in Princess Mononoke -
And also in Ong-Bak -
I've got to see Grave of the Fireflies
Also there's a part in Princess Mononoke -
near the beginning, right after Ashitaka is infected by the demon, and his village's elders are sitting at that meeting. The oldest one talks about all the misfortunes that their people have endured: "Sometimes I feel as though the Gods are laughing at us..." And now their last Prince has to be exiled. And then right before he leaves and his sister says good bye and gives him the necklace... 
And also in Ong-Bak -
When the blonde dude is crushed by the giant buddha statue in the end, and he says goodbye to his sister and everything
I've got to see Grave of the Fireflies