World Enough and Time

I found it. It's from "The Doctor Dances" - transcript here (http://who-transcripts.atspace.com/2005%20Transcripts/10_thedoctordances.htm). Excerpt:

DOCTOR
The nanogenes will clean up the mess and switch themselves off - because I just told them to. Nancy and Jamie will go to Doctor Constantine for help - ditto - all in all, all things considered - fantastic!

[Rose smiles at his enthusiasm]

ROSE
Look at you, beaming away like you're Father Christmas!

DOCTOR
Who says I'm not, red-bicycle-when-you-were-twelve?

ROSE [stares]
What??

DOCTOR [he holds his arms wide to embrace this fact]
And everybody lives, Rose! Everybody lives!

[He pings a switch on the console]

DOCTOR
I need more days like this.

ROSE
Doctor...

DOCTOR
Go on, ask me anything. I'm on fire!

ROSE
What about Jack?

[The Doctor's smile fades]

I love that scene - and that whole episode.

I'll go and work on my second random recap ramble

Good! Go for it!