For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much - the wheel, New York, wars and so on - whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man - for precisely the same reasons.

"I refuse to answer that question on the grounds that I don't know the answer."

"I'd far rather be happy than right any day." Slartibartfast

Marvin: "I am at a rough estimate thirty billion times more intelligent than you. Let me give you an example. Think of a number, any number."
Zem: "Er, five."
Marvin: "Wrong. You see?"

DON'T PANIC.

The ships hung in the sky in much the same way that bricks don't.

"If there's anything more important than my ego around, I want it caught and shot now."

"Time is an illusion. Lunchtime doubly so."

"Space," it says, "is big. Really big. You just won't believe how vastly hugely mindboggingly big it is. I mean you may think it's a long way down the road to the chemist, but that's just peanuts to space.

"You know," said Arthur, "it's at times like this, when I'm trapped in a Vogon airlock with a man from Betelgeuse, and about to die of asphyxiation in deep space that I really wish I'd listened to what my mother told me when I was young."
[Ford Prefect:] "Why, what did she tell you?"
[Arthur:] "I don't know, I didn't listen."

"The History of every major Galactic Civilization tends to pass through three distinct and recognizable phases, those of Survival, Inquiry and Sophistication, otherwise known as the How, Why and Where phases. For instance, the first phase is characterized by the question How can we eat? the second by the question Why do we eat? and the third by the question Where shall we have lunch?"

"You guys are so unhip it's a wonder your bums don't fall off."

Arthur: "Marvin, any ideas?"
Marvin: "I have a million ideas. They all point to certain death."

"I don't want to die now. I've still got a headache. I don't want to go to heaven with a headache, I'd be all cross and wouldn't enjoy it"

"What's up?" [asked Ford.]
"I don't know," said Marvin, "I've never been there."

I could calculate your chance of survival, but you won't like it.

"My capacity for happiness," he added, "you could fit into a matchbox without taking out the matches first"

"Six pints of bitter," said Ford Prefect to the barman of the Horse and Groom. "And quickly please, the world's about to end."

"Listen, three eyes,", he said, "don't you try to outweird me, I get stranger things than you free with my breakfast cereal."

"I've seen it. It's rubbish." About a Magrathean sunset that Arthur finds magnificent.

"Forty-two," said Deep Thought, with infinite majesty and calm. The answer to "the Great Question of Life, The Universe, and Everything"

"It is most gratifying," it said, "that your enthusiasm for our planet continues unabated, and so we would like to assure you that the guided missiles currently converging with your ship are part of a special service we extend to all of our most enthusiastic clients, and the fully armed nuclear warheads are of course merely a courtesy detail. We look forward to your custom in future lives ... thank you."

On being left in a parking lot for 500 million years: "The first ten million years were the worst. And the second ten million years, they were the worst too. The third ten million years I didn't enjoy at all. After that I went into sort of a decline"

"Ford," he said, "you're turning into a penguin. Stop it."

"That's right!" shouted Vroomfondel, "we demand rigidly defined areas of doubt and uncertainty!" Vroomfondel, a philosopher.