Victoria

“Harriet Jones: When they fart, if you'll pardon the word, it doesn't smell like a fart, pardon the word, it's like something else. What is it? It's more like um...
Rose: Bad breath!
Harriet Jones: That's it!
The Doctor: Calcium decay! Now that narrows it down! Calcium phosphate. Organic calcium—living calcium—creatures made out of living calcium, what else? What else? Hyphenated surname! YES! That narrows it down to one planet: Raxacoricofallapatorius!
Mickey Smith: [dryly] Oh yeah, great. We can write 'em a letter!”
― Russell T. Davies

“Doctor Who: You want weapons? We're in a library. Books are the best weapon in the world. This room's the greatest arsenal we could have. Arm yourself!

(from Tooth and Claw in Season 2)”
― Russell T. Davies

“Cyber Leader: Daleks, be warned. You have declared war upon the Cybermen.
Dalek Sec: This is not war - this is pest control!
Cyber Leader: We have five million Cybermen. How many are you?
Dalek Sec: Four.
Cyber Leader: You would destroy the Cybermen with four Daleks?
Dalek Sec: We would destroy the Cybermen with one Dalek! You superior in only one respect.
Cyber Leader: What is that?
Dalek Sec: You are better at dying.”
― Russell T. Davies

“Come on, Rory! It isn't rocket science, it's just quantum physics!
-The Doctor (Matt Smith)”
― Steven Moffat