The Lorax does it for me. DD and I ended up watching it a few times. I've read the story to her.
She is a bit young to know this, but -- it was my favorite movie as a kid. It always made me cry and it still does. Even the movie makes me cry.
I feel like a wuss, but that's the truth of it.
Are there any children's movies or books that have really touched you in some way?