Quote from Phoebe in The One with the Dollhouse
Monica: All right, Phoebe, you know what? That's it. That's it. No dinosaurs, no ghosts, no giant dogs, okay? They're not the right size, they're not Victorian and they just don't go. Phoebe: Okay, fine. Come, dinosaur. We're not welcome in the house of no imagination. Ross: Uh, Pheebs, while we're hovering around the subject, I have to say that dinosaurs, they don't go, "ruff!" Phoebe: The little ones do.