Ten: Well, well, well! Is this old home week or what? Ianto Jones and Jack Harkness! What are you doing here?

Ianto: Living in nonlinear_lover's brain.

Rose: Jack, I thought you lived in here with us?

Jack: Yes, well, that's one of the advantages to being fictional; I can live anywhere I want.

Rose: It's a lot of fun in here, you know. Every once in a while we can make her say twisted and bizarre things to her students, and watch their brains fold in half.

Ten: Rose! You wouldn't do that to students!

Nine: Oh, shut up. You love it, too. Don't think I've not seen you whispering into her brain stem.

Ten (with great dignity): I was helping her to remember a specific scientific fact, thank you very much.

Jack: Was it physics? I like physics. The permutations of three people in a big TARDIS bed...

Nine: (rolls eyes)