Well, what else would you say after walking through the doors of an ordinary police box to find yourself in the middle of an infinitely sized space and time vessel? Any other passing remarks? He's heard them all. Apart from "It's smaller on the outside". He'd never heard that one before. Trust Clara Oswald to break the mould.
Dan Butler is the Doctor Who Editor at WhatCulture.com. When he isn't writing his own articles or editing other people's, he can be found trawling the internet for gifs of Steven Moffat laughing. Contact him via dan.butler@whatculture.co.uk.