Goosnargh," said Ford Prefect, which was a special Betelgeusian word he used when he knew he should say something but didn't know what it should be.

Time travel, by its very nature, was invented in all periods of history simultaneously.

A computer terminal is not some clunky old television with a typewriter in front of it. It is an interface where the mind and body can connect with the universe and move bits of it about.

Six pints of bitter, said Ford Prefect. And quickly please, the world's about to end.

The Guide is definitive. Reality is frequently inaccurate.

One of the major problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can't cope with.

There are two things in particular that it [the computer industry] failed to foresee: one was the coming of the Internet(...); the other was the fact that the century would end.