Those who personally know Rose Tyler and "John W. Smith" - for instance, Kaitlyn - found the following exchange in "Christmas at Ground Zero" paralytically funny:

The Professor: Oi oi oi! Where d'you think you're going?

Lord Eccleston (pausing at the door): 1967.

The Professor: Go out there, dressed like that, you'll get us arrested, Oscar Wilde! (pointing) There's a wardrobe through there. First left, second right, third room on the left, go straight ahead, under the stairs, past the bins, fifth door on your left. 'Urry up!