Favorite ninth doctor conversations (all from the same episode surprisingly)
Jack Harkness: [pointing his squareness gun at the empty people] Okay, this can function as a sonic blaster, a sonic cannon, and a triple-enfolded sonic disruptor. Doc, what you got?
The Doctor: A sonic... er... oh, never mind.
Jack Harkness: What?
The Doctor: It's sonic, okay? Let's leave it at that.
Jack Harkness: Disruptor? Cannon? What?
The Doctor: It's sonic! Totally sonic! I am sonic-ed up!
Jack Harkness: A sonic what?!
The Doctor: Screwdriver!
Jack Harkness: Who has a sonic screwdriver?
The Doctor: I do!
Jack Harkness: Who looks at a screwdriver and thinks "Ooh, this could be a little more sonic"?
The Doctor: What, you've never been bored? Never had a long night? Never had a lot of cabinets to put up?
The Doctor: Don't drop the banana!
Jack Harkness: Why not?
The Doctor: Good source of potassium!
The Doctor: Sonic blaster, 51st Century... weapon factories at Villengard?
Capt. Jack Harkness: Yeah. You've been to the factories?
The Doctor: Once.
Jack: They're gone now, destroyed. Main reactor went critical, vaporised the lot.
The Doctor: Like I said, once... There's a banana grove there now. I like bananas. Bananas are good.
[Later]
Jack: Nice switch.
The Doctor: Thanks. From the groves at Villengard. Thought it was appropriate.
Jack: There's really a banana grove in the heart of Villengard, and you did that?
The Doctor: Bananas are good.