Jack Harkness: Doc, what you got?
Doctor: I’ve got a sonic… Never mind.
Jack Harkness: What?
Doctor: It’s sonic, okay? Let’s leave it at that.
Jack Harkness: Disruptor? Cannon? What?
Doctor: It’s sonic, totally sonic. I am soniced up.
Jack Harkness: A sonic what?
(Tiny bit later…)
Jack Harkness: Who has a sonic screwdriver?
Doctor: I do.
Jack Harkness: Who looks at a screwdriver and thinks, “Ooh, this could be more sonic?”
Doctor: You’ve never been bored? Never had a long night? Never had a lot of cabinets to put up?
From Doctor Who – Season 1 Episode 10: ‘The Doctor Dances’ (1×10)