Ach ja, Dr. Who ...

Donna: It's a murder, a mystery and Agatha Christie!

The Doctor: So? Happens to me all the time.

Donna: I know but isn't that a bit weird? Agatha Christie didn't walk around surrounded by murders, not really. That's like meeting Charles Dickens surrounded by ghosts at Christmas!

Doctor: Well...

Donna: Oh come on! It's not like we could drive across country and find Enid Blyton having tea with Noddy! Could we? Noddy's not real—is he? Tell me there's no Noddy!

The Doctor: There's no Noddy.