I don't think this is much of a spoiler but I'll put it in spoiler tags anyway. But my favorite quote from all three books is this and it better be in the movie.
Spoiler for favorite quote:
Hit-Girl trying to deal with school "it" girls without killing them...(said at Big Daddy's grave) "Daddy you taught me how to blind a man with my thumbs, build a bomb with the contents of a kitchen cabinet and skin a wolf with my bare hands. I've shot people, choked people, even drowned a motherfucker.... why can't I handle these bitches?"