- Dr. Monnitoff?
- Donnie.

4 seconds sound clip from the Donnie Darko movie soundboard.

You can hear this line at 00:51:09 in the Blu-ray version of the movie.

Quote context

[...]

- Our paths through life must be righteous. I urge you to go home and look in the mirror and pray that your son doesn't succumb to the path of fear.

- Wait. Do you remember that weird gym teacher Mrs. Farmer?

- Yeah. Okay, well, my brother told her to shove a book up her ass today.

- And then my parents just bought him all this new shit.

- Yeah, I know. I wish a jet engine would fall in my room.

- Dr. Monnitoff?

- Donnie.

- Um, I know this is gonna sound kind of weird, but, uh, do you know anything about, um, time travel?

- Ah, a wormhole with an Einstein-Rosen bridge which is, theoretically, a wormhole in space controlled by man.

- So, according to Hawking, a wormhole may be able to provide a shortcut for jumping between two distant regions of space-time.

- So in order to travel back in time, you have to have a big spaceship or something that can travel faster than the speed of light?

- Theoretically.

- And be able to find one of these wormholes?

[...]