well, the only thing i was thinking about that was emotional while i was watching the movie was that Harry wanted to see his dad so much and kept saying "he'll be here, any minute." that's what i thought was sad but now that i look back on it, it is very powerful thinking that Harry really did conjure up such a powerful spell when he thought he couldn't do it and he thought it was his dad. and he saved his own life and Sirius's. (and in the book, Hermione too.)