You aren't gonna tell Mom, are you?
3 seconds sound clip from the Donnie Darko movie soundboard.
You can hear this line at 01:01:53 in the Blu-ray version of the movie.
Quote context
[...]
- I just want it to be at a time when it...
- When it reminds you how beautiful the world can be?
- Yeah.
- And right now there's some fat guy over there staring at us.
- I think we should buy him a moped.
- I think we should get a divorce.
- You aren't gonna tell Mom, are you?
- 'Cause you tell Mom everything.
- Thank you for seeing us at such late notice.
- We both felt that it was time for us to come in and discuss...
- What I think is going on with your son?
- Yes.
[...]