For seven and a half million years, Deep Thought computed and calculated, and in the end announced that the answer was in fact Forty-two - and so another, even bigger, computer had to be built to find out what the actual question was.

He learned to communicate with birds and discovered their conversation was fantastically boring. It was all to do with windspeed, wingspans, power-to-weight ratios and a fair bit about berries.

I am rarely happier than when spending an entire day programming my computer.

I am terribly proud of-I was born in Cambridge in 1952 and my initials are DNA!

The Guide is definitive. Reality is frequently inaccurate.

It is known that there are an infinite number of worlds, simply because there is an infinite amount of space for them to be in. However, not every one of them is inhabited. Therefore, there must be a finite number of inhabited worlds. Any finite number divided by infinity is as near to nothing as makes no odds, so the average population of all the planets in the Universe can be said to be zero. From this it follows that the population of the whole Universe is also zero, and that any people you may meet from time to time are merely the products of a deranged imagination.

He picked up the letter Q and hurled it into a distant privet bush where it hit a young rabbit. The rabbit hurtled off in terror and didn’t stop till it was set upon and eaten by a fox which choked on one of its bones and died on the bank of a stream which subsequently washed it away. During the following weeks Ford Perfect swallowed his pride and struck up a relationship with a girl who had been a personnel officer on Golgafrincham, and he was terribly upset when she suddenly passed away as a result of drinking water from a pool that had been polluted by the body of a dead fox.