DOCTOR: This world is uninhabited. Nobody lives here and – so far – nobody has ever lived here. There’s wildlife, yes, but nobody that could look up and say, “Look at those five stars over there. They remind me of that weird fish I saw in the river the other day.

RUBY: They don’t look anything like a fish. They look like a slipper.

DOCTOR: That’s something else that hasn’t happened before

RUBY: What?

DOCTOR: People arguing about what’s right in front of them. Next one of us will start a religion worshipping the Great Fish of the Stars and the other will declare themselves a follower of the Celestial Bedsock and, before we know it, the world’ll go to hell in a handbag