The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned by no later than the date shown; and 3) Do not interfere with the nature of causality.

Neither claimed any responsibility for Milton Keynes, but both reported it as a success.

That's why it's always worth having a few philosophers around the place. One minute it's all is truth beauty and is beauty truth, and does a falling tree in the forest make a sound if there's no one there to hear it, and then just when you think they're going to start dribbling one of 'em says, incidentally, putting a thirty-foot parabolic reflector on a high place to shoot the rays of the sun at an enemy's ships would be a very interesting demonstration of optical principles.

You can't remember the plot of the Dr Who movie because it didn't have one, just a lot of plot holes strung together. It did have a lot of flashing lights, though.

You'll see! We're going to the palace. Fetch Angua. We might need her. And bring the search warrant. You mean the sledgehammer, sir? Yes.

Most horses don't walk backwards voluntarily, because what they can't see doesn't exist.

Two types of people laugh at the law: those that break it and those that make it.