For kayjayuu

[monkeybard]

"Among all the varied wonders of the universe, there's nothing so firmly clamped shut as the military mind."
~ Doctor Who #7, Battlefield

"Circular logic will only make you dizzy, Doctor!"
~ Peri, The Two Doctors (I think)

"What's wrong with 'unsinkable'?"
"Nothing...said the iceberg to the Titanic. Glub, glub, glub."
~ Brigadier Alistair Gordon Lethbrigde-Stewart and Doctor Who #4, Robot

ETA: I just thought of another classic. :D

"Just once I'd like to meet an alien menace that wasn't imune to bullets."
~ Brigadier Alistair Gordon Lethbrigde-Stewart, Robot

And one for the Newbie Whovians (and because I'm a Shakespeare geek and I loved this moment):

"Come on! We can all have a good flirt later."
"Is that a promise, Doctor?"
"Oh, fifty-seven academics just punched the air."
~ Doctor Who #10 and William Shakespeare, The Shakespeare Code