Here are some of the most hillarious quotes from the series that continues to redefine the word "Trilogy".

"There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.

There is another which states that this has already happened."

Like all Vogon ships it looked as if it had been bot so much designed as congealed. The unpleasant yellow lumps and edifices which protruded from it at unsightly angles would have disfigured the looks of most ships, but in this case that was sadly impossible. Uglier things have been spotted in the skies, but not by reliable witnesses.
In fact to see anything much uglier than a Vogon ship you would have to go inside it and look at a Vogon."

"It has been said that Vogons are not above a little bribery and corruption in the same way that the sea is not above the clouds , and this was certainly true in his case. When he heard the words 'integrity' or 'moral recititude' he reached for his dictionary, and when he heard the chink of ready money in large quantities he reached for the rule book and threw it away."

"Listen, I'm Zaphod Beeblebrox , my father is was Zaphod Beeblebrox the 2nd, by grandfather Zaphod Beeblebrox the 3rd..."
"What?"
"There was an accident with a contraceptive and a time machine."

"Can't you stop listening about yourself on the radio?"
"Nope."
"We picked up some hitchhikers...put your ego aside for one minute!"
"If there's anything more important than my ego around, I want it caught and shot NOW"

The Total Perspective Vortex derives its picture of the whole Universe on the principle of extrapolated matter analyses.
To explain -- since every piece of matter in the Universe is in some way affected by every other piece of matter in the Universe, it is in theory possible to extrapolate the whole of creation -- every sun, every planet, their orbits, their composition and their economic and social history from, say, one small piece of fairy cake.
The man who invented the Total Perspective Vortex did so basically in order to annoy his wife.
Trin Tragula -- for that was his name -- was a dreamer, a thinker, a speculative philosopher or, as his wife would have it, an idiot.
And she would nag him incessantly about the uterly inordinate amount of time he spent staring out into space, or mulling over the mechanics of safety pins, or doing spectrographic analyses of pieces of fairy cake.
"Have some sense of proportion!" she would say, sometimes as often as thirty-eight times in a single day.
And so he built the Total Perspective Vortex -- just to show her.
And into one end he plugged the whole of reality as extrapolated from a piece of fairy cake, and into the other end he plugged his wife: so that when he turned it on she saw in one instant the whole infinity of creation and herself in relation to it.
To Trin Tragula's horror, the shock completely annihilated her brain: but to his satisfactio he realized that he had proved conclusively that if life is going to exist in a Universe of this size, then the one thing it cannot afford to have is a sense of proportion.

For when you are put into the Vortex you are given just one momentary glimpse of the entire unimaginable infinity of creation, and somewhere in it a tiny little marker, a microscopic dot on a microscopic dot, which says, "You are here."

It is a currious fact, and one to which no one knows quote how much importance to attach, that something like 85 percent of all known worlds in the Galaxy, be they primitive or highly advanced, have invented a drink called jynnan tonnyx, or gee-N-N-T'N-ix, or jinond-o-nicks, or any one of a thousand or more variations on the same phonetic theme. The drinks themselves are not the same, and vary between the Sivolvian "chinanto/mnigs" which is ordinary water served at slightly above room temperature, and the Gagrakackan "tzjin-anthony-ks" which kills cows at a hundred paces; and in fact the one common factor between all of them, beyond that fact that the names sound the same, is that they were all invented and named BEFORE the worlds concerned made contact with any other worlds.

What can be made of this fact? It exists in total isolation. As far as any theory of structural linguistics is concerned it is right off the graph, and yet it persists. Old structural liguists get very angry when young structural linguists go on about it. Young structural linguists get deeply excited about it and stay up late at night convinced that they are very close to something of profound importance, and end up becoming old structural linguists before their time, getting very angry with the young ones. Structural linguistics is a bitterly divided and unhappy discipline, and a large number of its practitioners spend too many nights drowning their problems in Ouisghian Zodahs.

"You barbarians! I'll sue the council for every penny it's got! I'l have you hung, drawn, and quartered! And whipped! And boiled...until...until...until you've had enough. And then I will do it again! And when I've finished I will take all the little bits, and I will JUMP on them! And I will carry on jumping on them until I get blisters, or I can think of anything even more unpleasant to do..." - Arthur Dent