This is a common occurrence among paranoid schizophrenics.

— Dr. Lillian Thurman (Katharine Ross)

6 seconds sound clip from the Donnie Darko movie soundboard.

You can hear this line at 01:04:02 in the Blu-ray version of the movie.

Quote context

[...]

- Let me just lay out what I believe is happening here.

- Donnie's aggressive behavior, his increased detachment from reality, seem to stem from his inability to cope with the forces in the world he perceives to be threatening.

- Has he ever told you about his friend Frank?

- Frank?

- Yes, the giant bunny rabbit.

- The what?

- I don't recall him ever having mentioned a rabbit.

- Donnie is experiencing what is commonly called a daylight hallucination.

- This is a common occurrence among paranoid schizophrenics.

- What can we do?

- I would like to, um, do more hypnotherapy and increase his medication.

(ENERGY BEAM) (2)

- Whatever will help him, really, because that's why we're here.

[...]