"There is a thin, invisible strand between the audience and the screen. It’s called believability. That strand gets stronger and stronger as the picture progresses. It can be easily snapped if you start out being too crazy or unbelievable. As Bill Walsh says: “an audience must believe in and care about your lead characters over the unspooling of the first reel (ten minutes) of the movie. If they truly believe, you can take them anywhere.”
"You have to make the audience care about your on-screen people and their dilemmas, and when that occurs you’ve created believable unbelievability. Audience will just not get with a film that starts with what they perceive as unbelievable unbelievability.
"Movies are unbelievable. Your job is to make the audience believe its unbelief."
- Lew Hunter in his book “Screenwriting 434”