10 Doctor Who Scenes You Didn't Know Were Unscripted

10. “It's Bigger On The Inside!”

In The Husbands of River Song, the Twelfth Doctor makes a big speech about the TARDIS being bigger on the inside, pretending to be an oblivious newbie whose “entire understanding of physical space has been transformed!"

It's a glorious moment, but this wasn’t the first time the stock response to the TARDIS' dimensions had been played for laughs.

Following a fairly standard “bigger on the inside” scene in Rose, Smith and Jones presented the crew with an opportunity to have a bit more fun.

Hence why – when Martha enters the TARDIS at the end of the episode and speaks that iconic line – the Doctor mouths along, before flippantly responding, “Is it? I hadn’t noticed!”.

Although the dialogue here was scripted, the Doctor miming along with Martha's "bigger on the inside" was an ad-lib by David Tennant.

It’s a funny moment in its own right, but it's also totally in keeping with the more aloof, sarcastic characterisation of the Doctor in Series 3, following the loss of Rose.

This is a Doctor who has much less time for prospective companions than usual, yet still finds himself showing off. Even when no-one’s looking!