The scene when Marnie compares herself and her siblings to coach-potato's.
Gwen: I'm just trying to protect you.
Marnie: Yeah, you're protecting us from being anything but a bunch of vegetables. (sits down) Hey look! I'm a potato, are you happy now? Maybe I'll put down some roots in the carpet. (mockingly) Oh no Marie, it's too dangerous! There're things about vegetables that YOU don't understand.