- Has he ever told you about his friend Frank?
- Frank?
- Yes, the giant bunny rabbit.

— Dr. Lillian Thurman (Katharine Ross)

13 seconds sound clip from the Donnie Darko movie soundboard.

You can hear this line at 01:03:20 in the Blu-ray version of the movie.

Quote context

[...]

- We both felt that it was time for us to come in and discuss...

- What I think is going on with your son?

- Yes.

- Um. Well, he's, um... You know about his past and he was suspended from school for insulting his gym teacher.

- I'm not really sure that's a good example. I think he had just cause to insult her.

- 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?

[...]