Hitchhiker's, volume 4.
This is noticeably less good than it's three predecessors, particularly in terms of plot, but it still has plenty of splashes of brilliance:
Arthur and Fenchurch fly.
Wonko the Sane declaring the world beyond his inside-out house is an asylum.
Rob McKenna is a rain god but doesn't know it - only that it always rains wherever he goes - the loving clouds just want to water him.
"All eyes were on Ford Prefect. Some of them were on stalks".
"As stunned as a man might be who, having believed himself to be totally blind for 5 years, suddenly discovers that he had merely been wearing too large a hat" (one for or from Blackadder, surely).
"She seemed to be looking at something other than what she looked as if she was looking at".
"Waited and waited for the nothing that he knew was about to happen. As the time came for it not to happen, it duly didn't happen".
"The recurring impression he had that just when he was least expecting it, the universe would suddenly leap out from behind a door and go boo at him".
A hotel "they would enjoy being puzzled by".
Two women looking at the Pacific for the first time and one says "It's not as big as I expected".
A & F find God's final message to creation ("We apologise for the inconvenience").
Brief summary and favourite quotes from the other four of the five books, as follows:
Hitchhiker's Guide (vol 1): http://www.goodreads.com/review/show/107767859
Restaurant at the End of Universe (vol 2): http://www.goodreads.com/review/show/107768059
Life, the Universe and Everything (vol 3):
Mostly Harmless (vol 5): http://www.goodreads.com/review/show/107768298