Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.

'The difficulty with this conversation,' said Arthur after a sort of pondering look had crawled slowly across his face like a mountaineer negotiating a tricky outcrop, 'is that it's very different from most of the ones I've had of late. Which, as I explained, have mostly been with trees.'

One nonabsolute number is the given time of arrival, which is now known to be one of the most bizarre of mathematical concepts, a number whose existence can only be defined as being anything other than itself. In other words, the given time of arrival is the one moment of time at which it is impossible that any member of the party will arrive.

We are not an endangered species ourselves yet, but this is not for lack of trying.

Arthur Dent: What happens if I press this button? Ford Prefect: I wouldn't- Arthur Dent: Oh. Ford Prefect: What happened? Arthur Dent: A sign lit up, saying 'Please do not press this button again.

[The Head of Radio Three] had been ensnared by the Music Director of the college and a Professor of Philosophy. These two were busy explaining to the harassed man that the phrase "too much Mozart" was, given any reasonable definition of those three words, an inherently self-contradictory expression, and that any sentence which contained such a phrase would be thereby rendered meaningless and could not, consequently, be advanced as part of an argument in favour of any given programme-scheduling strategy.

Ahenny (adj.) - The way people stand when examining other people's bookshelves.