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.

Marvin started his ironical humming again. Zaphod hit him and he shut up.

In the center lay the exploded carcass of a lonely sperm whale that hadn't lived long enough to be disappointed with its lot.

The bowler approached the wicket at a lope, a trot, and then a run. He suddenly exploded in a flurry of arms and legs, out of which flew a ball.

The system of life on this planet is so astoundingly complex that it was a long time before man even realized that it was a system at all and that it wasn't something that was just there.

For a moment he felt good about this. A moment or two later he felt bad about feeling good about it. Then he felt good about feeling bad about feeling good about it and satisfied, drove on into the night.

There was one planet off in the seventh dimension that got used as a ball in a game of intergalactic bar billiards. Got potted straight into a black hole.