I've gotten the sniffles from quite a few Disney films, but I actually cried when I saw Mulan and her father said (without spoiling the plot for those who have seen it I won't name the scene) "The greatest gift and honor is having you for a daughter."
I was surprised no one mentioned the song from Pinocchio! When you wish upon a star! Every time I hear that song, no matter if it is in the movie itself, at the park, on a commercial, or even on Radio Disney, I cry! I can't help it. I believed in that song as a little girl, and I still do. Every time I hear that song, it sums up all my most fondest Disney memories and the dreams I still hold onto. Even writing this I am getting misty. Gah! I'm hopeless!