If we see you smoking we will assume you are on fire and take appropriate action.

The World Wide Web is the only thing I know of whose shortened form takes three times longer to say than what it's short for.

All you really need to know for the moment is that the universe is a lot more complicated than you might think, even if you start from a position of thinking it's pretty damn complicated in the first place.

The Answer to the Great Question... Of Life, the Universe and Everything... Is... Forty-two,' said Deep Thought, with infinite majesty and calm.

Who should play the lead role in a film about me? Dunno. Danny De Vito? Jeff Goldblum? Meryl Streep? Someone of that kind.

You cannot see what I see because you see what you see. You cannot know what I know because you know what you know. What I see and what I know cannot be added to what you see and what you know because they are not of the same kind. Neither can it replace what you see and what you know, because that would be to replace you yourself." "Hang on, can I write this down?" said Arthur, excitedly fumbling in his pocket for a pencil.

It's good to leave your room super-messy when you're away. Whoever tries to break into your room will thought it has already been ransacked.