"The Hitch Hiker's Guide to the Galaxy offers this definition of the word "Infinite". Infinite: Bigger than the biggest thing ever and then some. Muc… - Douglas Adams

After a fairly shaky start to the day, Arthur's mind was beginning to reassemble itself from the shell-shocked fragments the previous day had left him with.
He had found a Nutri-Matic machine which had provided him with a plastic cup filled with a liquid that was almost, but not quite, entirely unlike tea.
The way it functioned was very interesting. When the Drink button was pressed it made an instant but highly detailed examination of the subject's taste buds, a spectroscopic analysis of the subject's metabolism and then sent tiny experimental signals down the neural pathways to the taste centers of the subject's brain to see what was likely to go down well. However, no one knew quite why it did this because it invariably delivered a cupful of liquid that was almost, but not quite, entirely unlike tea.

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

"Zaphod left the controls for Ford to figure out, and lurched over to Arthur.

"Look, Earthman," he said angrily, "you've got a job to do, right? The Question to the Ultimate Answer, right?"

"What, that thing?" said Arthur, "I thought we'd forgotten about that."

"Not me, baby. Like the mice said, it's worth a lot of money in the right quarters. And it's all locked up in that head thing of yours."

"Yes but ..."

"But nothing! Think about it. The Meaning of Life! We get our fingers on that we can hold every shrink in the Galaxy up to ransom, and that's worth a bundle. I owe mine a mint."

Arthur took a deep breath without much enthusiasm.

"Alright," he said, "but where do we start? How should I know? They say the Ultimate Answer or whatever is Forty-two, how am I supposed to know what the question is? It could be anything. I mean, what's six times seven?"

Zaphod looked at him hard for a moment. Then his eyes blazed with excitement.

"Forty-two!" he cried.

Arthur wiped his palm across his forehead.

"Yes," he said patiently, "I know that."

Zaphod's faces fell.

"I'm just saying that the question could be anything at all," said Arthur, "and I don't see how I am meant to know.