10) Hotaru No Haka (Grave Of The Fireflies, 1988)
This movie was SO good but I dont think I could put it on a top 20 because I dont think I will ever be able to watch it again. Its number one on my "hard to rewatch" list for sure. If a race of sentient, but human looking, robots ever invade earth and we need a test to figure out who is human and who is not, we just show people this movie. If they dont cry they are not human!
First, my caveats: I am a huge animation fan, especially Miyazaki. And I can get "dusty-eyed" at almost anything since my son was born (don't know why, but so it has been for 16 and a half years). Also, I have deep compassion for those in need.
That said, I found Grave of the Fireflies to not move me. I apprecaiated their plight, and had compassion for them, but they were just never real to me. So, as opposed to every Miyazaki or Pixar or even Paprika and Tekkonkinkreet, I had no emotions for these two-- they were just cartoon characters. Two dimentional, flat. So it was just a lot of depressing, but it didn't go anywhere for me. Gave me some good info about WWII Japan, though-- not as much as Letters from Iwo Jima, though.