A short film included as a bonus feature on the Toy Story 3 Blu-Ray. According to writer Michael Arndt:
I’m aware the model I set up here applies imperfectly to TS3 itself. (It applies much more cleanly [for example] to TOOTSIE, which I consider one of the best comedy first acts of all time.) The broader point is that the emotional fuel for your first act break is largely set up in your inciting incident — and that is something that does apply to TS3.
(via John August)