Gwen prepared to respond with a quip about parking tickets, as she tries to avoid commenting on the rather rugged looking TARDIS in front of her. She doesn't think the Doctor would appreciate her remarking about it so early in the game, so she keeps her mouth shut and slips past into the door, wondering how an advanced alien race manages to travel in such a tiny--

Ok, that would be how.

And, well, since you asked so nicely.

"It's... bigger on the inside," Gwen remarked dumbly, standing in the carnivorous interior of the TARDIS.