while not a movie in the true sense, rather a doco.
The story of the guys that do charity work dressed as Stormtroopers.
Some of the kids they visit and the horrors they face in day to day life inspires me and makes me cry at the same time. Sometimes i think ive got it hard, but then i remember at least im not a 6 or 8 year old kid with a week or two left to live, without having lived much of a life outside of the hospital up to this point.
this is of course outside of many already mentioned.
Grave of fireflies is high on that list too.
2nd edit: there was also this cartoon from when i was a kid ( 25 years or there abouts ) about a gnome and his friends, also his wife. At the end of the series they die and turn into trees.. i was 8 or may be 10.. any way, tears were shed.