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For the really scary stuff to work at the end you have to fall in love a little bit with the family and want then to be ok. And once you get the audience to buy in on that then they care. They want them to be okay.

"Ron Livingston Talks the Conjuring, Why He Got Involved, Meeting His Real-life Counterpart, Building Chemistry With His Film Family and the Immersive Set". Interview with Dave Trumbore, collider.com. June 26, 2013.
For the really scary stuff to work at the end you have to fall in love a little bit with the family and want then to be ok. And once you get the audience to buy in on that then they care. They want them to be okay.