The Pan Galactic Gargle Blaster is the best drink in existence.
Drinking one is like having your brains smashed out by a slice of
lemon wrapped around a large gold brick. 

For the original Pan Galactic Blaster: 

Take the juice from one bottle of Ol' Janx Spirit. 

Pour into it one measure of water from the seas of Santraginus V - Oh,
that Santraginean seawater. Oh, those Santraginean fish! 

Allow three cubes of Arcturan Mega-gin to melt into the mixture (it
must be properly iced or the benzine is lost). 

Allow four liters of Fallian marsh gas to bubble through it, in memory
of all those happy hikers who have died of pleasure in the Marshes of
Fallia. 

Over the back of a silver spoon float a measure of Qualactin Hypermint
extract, redolent of all the heady odors of the dark Qualactin Zones,
subtle, sweet and mystic. 

Drop in the tooth of an Algolian Suntiger. Watch it dissolve, spreading
the fires of the Algolian Suns deep into the heart of the drink. 

Sprinkle Zamphuor. 

Add an olive. 

Drink...but...very carefully... 

This is great, but we have limitations being stuck on Earth. I haven't
picked up any way of getting off this planet on my Sub-Etha
Sens-O-Matic, so you'll have to make do. Give me your versions of a
Pan Galactic Gargle Blaster! Just send them to
scottmail@hotmail.com. 

To make a Pan Galactic Gargle Blaster using Terran ingredients: 

Take the liquid contained in a 200 ml bottle of EverClear to remind
you that your head will be clear forever if you drink too many Pan
Galactic Gargle Blasters, and that your brain will clear of anything
soon after you start drinking some, if not before. 

Into it, slowly pour a 750 ml bottle of Bombay Sapphire to remind you
of the marvelous beauty of the old Santraginean seas, or an equal
amount of Jeremiah Weed in acknowledgement of what has happened
to the Santraginean Seas and their lifeforms. 

Now add 750 ml of Cold Wild Turkey, letting it run into the mixture as
we run through life to remind us of all the lifeforms we meet and
experience while hitchhiking through the galaxy. 

Speedily stirring, add 375 ml of Herradua Tequila, mixing it in to
commemorate the galactic hitchhikers who died of pleasure among the
vapors and gasses in the marshes of Fallia. 

Over the bowl of a silver spoon, let flow 1 liter of rum in memory of the
waterfalls and their glorious rainbows encountered on your journeys
through the galaxy of life. 

Next, drop in the worm found in a bottle of Musquil, watching it
dissolve into the mixture. If the bottom falls out and the worm survives,
drink at your own risk. 

Finally, sprinkle into the mixture some Gatorade to commemorate the
lifeforms which have vanished and are becoming extinct, both sentient
and non-sentient, especially those most in need of aid. 

Before drinking, eat one olive to create a sweetness in it which is not
there. 

Drink very, very extremely carefully at your own risk, and remember
where your towel is (if you can). 

Submitter's note: This recipe has been placed into the public domain
by the author, and was previously published in "Mostly Harmless," the
fanzine of the ZZ9 Plural Zed Alpha fan club, Brighton, England. 

A non-alcoholic version for younger readers:

Take the liquid from any clear soda you have available, because you
will see everything clearly after this drink. Cherry flavoring enhances
the savor of the drink. 

Slowly pour in blue coloring for a wonderful color, because seeing is
always believing. (This is optional, in case you don't have any food
coloring.) 

Let Coke, Pepsi, or whatever you prefer, run into the mixture. Be
mesmerized by the spreading blackness like the black holes of space. 

Speedily stirring the mixture, add orange juice in honor of the brave
oranges who died to give you this drink. Revel in the circular logic of
this statement. 

Over the back of a silver spoon, spill a spoonful of sugar, in
commemoration of all the hyperactive children in the galaxy.
Rubberize your walls, for you shall be bouncing off of them. 

Drop in a single chocolate chip. This does not add much to the flavor,
but it is a treat for the end. 

Finally, sprinkle Gatorade over the mixture. Let the complex
carbohydrates and replenishing minerals confuse your mind with
their utter uselessness, even though everybody thinks they help. 

Now you have the drink, and you are in the correct frame of mind to
drink it, if you followed all the instructions up to now. 

Drink carefully. 

Drink some more carefully. 

The hell with carefulness, just drink it. 

Enjoy. 

Another:

     2 measures of vodka 
     1 measure of Bacardi 
     1 measure of Malibu 
     1 measure of tequila 
     1 measure of Blue Curacao 

The total volume of liquid is made up to 1 pint with lemonade or
orange juice, giving a blue or green drink. The green one is opaque
and glows (faintly) in the dark. 

The effect is not complete until the morning after, when the little people
will be trying to drill out of your head. Guaranteed to stun a 20 tonne
mega-elephant with bronchial pneumonia. 

And another one: 

About ten years ago the Hitch Hikers Guide to the Galaxy was shown
as a stage play at the Rainbow Theatre in North London and this is
the recipe that was shown in the Programme and that was being sold
at the bar: 

     70% Champagne 
     20% Vodka 
     10% Blue Curacao 
     A small silverskin onion 
     A sugar cube soaked in bitters 
     (also a lump of dry ice, if you can get it, for effect) 

I have no idea where they got the idea for this mixture but it tastes ok.
Have fun trying it 

Here's a nice one:

Get everything alcoholic you can find, including as much tequilla and
brandy as humanly possible. Add five drops of vanilla essence. Mix
them together, and add an olive, seeing as I can't find anything better.
Drink. 

Don't drink this around anyone who's respect you might want in the
morning. 

Note: Apart from drinking very carefully, use small shot glasses! The
rumours of feeling like you've had your brains smashed out with a
lemon twist wrapped around a gold brick are true! The recipe is: 

In a glass,

     Pour in 1/2 ounce of Peppermint Mist or Blue Curacao (blue
     liqueurs). 
     Add 3/4 ounce of Southern Comfort. 
     Gently pour in (at an angle) 1/2 ounce of 184 proof Alcool (yes,
     that's 92% straight grain alcohol!). 
     Over the back of a silver spoon, pour in a small amount of green
     food dye, and twirl the glass clockwise to create green `trails' in
     the alcool. 
     Drop in an Alka-seltzer tablet carved to look like a Arcturan
     suntiger's tooth (which coincidentally looks remarkably like an
     Earth feline's canine), which bubbles up thorough the mixture. 
     Add an olive, and if you've mixed it right, the olive will float in the
     middle of the drink, which is really froody! 
     Have a gold brick and a lemon twist handy so you can compare
     sensations and thus judge if the PGGB has been mixed correctly. 

More: 

Into a mug add the following: 

     1 part Bailey's Irish Cream 
     1 part Tia Maria, (Kaluha works but is not prefered) 
     1/2 to 1 part Amaretto, depending on taste 
     Hot Coffee, if there's room left. 

Obviously developed back when hot liquored coffees were the rage. 

This is a old southern drink that i think may fit the bill. The last
person who drank one claimed to have been abducted by vogons, or
that was what he told his wife, anyway. Here it is: 

     1.5 oz Jack Daniels 
     1.5 oz Southern Comfort 
     1.5 oz Jim Beam 
     1.5 oz 101 Fighting Cock aka Wild Turkey 
     1 oz triple sec 
     1 oz grenadine 
     Serve over crushed ice and fill almost to top with cola. 

Float midori on top and flame with 151 bacardi. 

One more: 

This recipe is the nearest equivalent to the real one, that will still taste
good. If you have any taste buds left by the time the messages get to
your brain. In a 12 oz. glass, pour 4 oz.'s of Goldschlager Cinnamon
Schnapps, 2 oz.'s of sparkling water (or Club Soda) about one oz. of
solid Aftershock Alcohol crystals. (Yes, they exist.) Allow some air from
a bottle of women's perfume to bubble through it in memory of all those
lonely nights drinking Pan Galactic Gargle Blasters, and all those to
come, pour 1 shot of peppermint schnapps over the back of a spoon
into the mixture, drop in an Algolian Suntiger Tooth (Melted or formed
red sugar in the shape of a tooth, or the best shape you can make it.)
sprinkle ginger, add an olive if you want, and drink. 

Yet another: 

Served in a half pint straight glass 

1 measure of :-
Vodka, Schnapps, Gin, Whiskey, White Rum & Dark Rum, 

Pour over 2 crushed ice cubes, slowly pour Grenadine over the mix until
glass is full. 

OK, no fancy ways of making this one, but the effect is the same as the
proper PGGB!!! 

OK, one last one: 

Take: 

     one shot of Gin 
     one shot of Vodka 
     one shot of white Rum 
     and add just enough of Blue Curacao (or any other blue drink) to
     make your Pan-Galactic turn the colour of burning spirits (I don't
     know its translation in English, but you may know what I mean.)