Mama (I) (2013)
Louise: A ghost is an emotion bent out of shape, condemned to repeat itself, time and time again until it rights the wrong that was done.
Dr. Dreyfuss: Extraordinary claims require extraordinary proof.
Young Victoria: Daddy! There's a woman outside... She's not touching the floor!
Dr. Dreyfuss: There is no rational explanation that supports this theory. But it is only the ability to embrace the different reality, that makes science expand beyond the limits of what we know. However, extraordinary claims require extraordinary proofs.