I have no idea if it was accidental, or an obscure joke by Douglas Adams, but I noticed that these quotes from novels both referred to the nature of impossibility and breakfast in remarkably similar ways. So, I’ve brought them together here on this very page…
Alice laughed. `There’s no use trying,’ she said. `One ca’n’t believe impossible things.’
`I daresay you haven’t had much practice,’ said the Queen. `When I was your age, I always did it for half-an-hour a day. Why, sometimes I’ve believed as many as six impossible things before breakfast.’
– Through The Looking-Glass (and what Alice found there), Lewis Carroll
If you’ve done six impossible things this morning, why not round it off with breakfast at Milliways – Restaurant at the End of the Universe.
– The Hitchhikers’ Guide to the Galaxy Radio Series, Douglas Adams
It is most certainly a joke from Adams, it is inconceivable that he had not read Alice in Wonderland – and in any case, that quote is one of the best known passages from the book, every Englishman worth his salt could tell you it!