[Oh, Martha knows that smile. He gives it to her, and she gives him an unimpressed look back]

So how likely is it that once we start the ceiling just drops down on us?

Or that we just have to keep playing until we've failed enough and the ceiling lands on us?

[She gives him a pleading look---please Doctor, please remember that I'm worthy of being talked to.] Tell me what is really going to happen here. Please.