It felt wrong to put this in my previous post, but I watched When the Wind Blows on Friday. If you've heard the David Bowie song of the same name, well, this is what it was the theme song for. It's an animated film from the 80s about an elderly British couple dealing with the threat of nuclear holocaust. Absolutely heartbreaking. The parallels with Grave of the Fireflies are pretty obvious, and I think WtWB definitely deserves to share the spot for "animated films most likely to make you cry". I was in tears for about half of it.