"The worst thing that can happen is when you have gone weeks and months into elaborate sequences and the storyline of the film changes and you find out they don't need it. Sometimes you don't shoot those sequences, or they have been shot and then get edited out of the sequence you've shot gets changed and needs to be redone. That can be hard. It's not heartbreaking, but you do tend to think, "Och, all that work and effort." But that's filming, you know? You put all of these modular things into the pot, and sometimes they don't all get used."