Believe me, it is a great deal better to find cast-iron proof that you're innocent than to languish in a cell hoping that the police---who already think you're guilty---will find it for you.

The most misleading assumptions are the ones you don't even know you're making.

Zaphod did not want to tangle with them and, deciding that just as discretion is the better part of valor, so was cowardice is the better part of discretion, he valiantly hid himself in a closet.

And so the Universe ended.

Everybody has their moment of great opportunity in life. If you happen to miss the one you care about, then everything else becomes eerily easy.

...and the renewed shock had nearly made him spill his drink. He drained it quickly before anything serious happened to it. He then had another quick one to follow the first one down and check that it was all right.

The hardest assumption to challenge is the one you don't even know you are making.