Raxacoricofallapatorius

I've been reading the scripts for "The Empty Child"/"The Doctor Dances", easily my favorite story of the first season of new Who. I've only seem them once, at Chicago Tardis, where I admired the writing, acting, production, etc. Now, though, reading the script, I'm even more struck by Steven Moffat's dialogue and characterization. There's one exchange, however, between the Doctor and Rose that I completely missed when watching the episode:

THE DOCTOR (emerging, mid-conversation)
Know how long you can knock around space without happening to bump into Earth?

ROSE Five days. Or is that just when we're out of milk?

THE DOCTOR All the species, in all the universe - and it's gotta come out of a cow.

--Doctor Who The Shooting Scripts p. 315

Ignoring the obvious - cold storage, powdered, keep a cow in the TARDIS Pasture Room - this is excellent writing, witty and sharp. And, of course, it explains why the Doctor, or at least this particular Doctor, spent pretty much his entire first season on or near Earth.

Wouldn't the Doctor make for a grand "Got Milk?" ad? :)