The Pan Galactic Gargle Blaster is an alcoholic drink which is mentioned in The Hitchhiker's Guide to the Galaxy, invented by Zaphod Beeblebrox. The effect of a Pan Galactic Gargle Blaster is said to be like having your brains smashed out by a slice of lemon wrapped round a large gold brick.

When I lived in Hull many years ago, there was a nightclub my friends and I used to go to called Spiders, and they served a drink called a Pan Galactic Gargle Blaster.

Here is their recipe:
Pernod
Galliano
Vodka
Cider
Pure orange
Blackcurrant
Ice

Unfortunately I have no idea of measurements, but I do know that it came in a pint glass and about half of the glass was filled with cider, probably calls for some experimentation. I also know that it was very cheap considering how much alcohol had gone into it, and you'd only need 2 or 3 to knock you on your arse.

You can find other recipes at Wikibooks.