I got a mail with the subject "So long and thanks for all the fish!" from my Manager. What does it mean?
It is a quotation from Episode Three of The Hitchhiker's Guide to the Galaxy radio series by Douglas Adams.
This is a comedy, the phrase, as used there, is to signify that Dolphins are more intelligent than humans.
In the story, Earth is destroyed, the dolphins knew this was coming and left the planet.
The full quotation is:
Curiously enough, the dolphins had long known of the impending demolition of Earth and had made many attempts to alert mankind to the danger. But most of their communications were misinterpreted as amusing attempts to punch footballs, or whistle for titbits, so they eventually gave up and left the Earth by their own means - shortly before the Vogons arrived. The last ever dolphin message was misinterpreted as a surprisingly sophisticated attempt to do a double backwards somersault through a hoop, whilst whistling the ‘Star-Spangled Banner’. But, in fact, the message was this “So long and thanks for all the fish”.
Subsequently, Douglas Adams published a book with the title So Long and Thanks for all the Fish which was based upon the original series.
So, in the context of your email, it is just an attempt at humour by someone leaving.
To boil it down to its most basic: It's a quote from The Hitchhiker's Guide to the Galaxy and has become a humorous way of saying "Goodbye".
"So long and thanks for all the fish" is the title of the fourth book from the "Hitchhiker's Guide to the Galaxy" tetralogy. Used in a message it is just a humourous way to say goodbye, calling to mind the leaving of the dolphins from Earth saying thanks for the fish they had gotten.
As the others have said, the line is a quote. The phrase "So long" is an informal synonym for "Goodbye".
The line is the title of a humorous novel by Douglas Adams. It refers to dolphins, who were much more advanced than we had thought, leaving Earth prior to its destruction to make room for a "hyperspace bypass". Having a particularly British sense of decorum, they could not leave without thanking us for the fish they had eaten.
I have no idea what your manager's email was about. In context with its subject line, it could be that he is good-naturedly announcing he will be away from the office for a while, or maybe permanently.
As others have said - it is a quote from Douglas Adams the Hitchikers Guide to the Galaxy.
Almost certainly he is referencing saying goodbye - probably on a permanent basis or possibly simply for a long time.
I just recently used this expression, and got the same question. Other answers (especially the one from Chenmunka) have described the reference, but I’m not sure they fully describe what I was trying to say. For me, and I believe most others, it's a humorous way to say 3 things simultaneously:
- Thanks for all the nice things you’ve done for me.
- The goodbye is permanent: I’m not coming back, and most likely I’ll never see or hear from any of you again.
It’s that third connotation that makes people want to use humor. It keeps the goodbye from being too melodramatic.
Adams' line "thanks for all the fish" might be a nod toward the intertextuality of several science fiction writers. Vonnegut's Kilgore Trout being his nod towards his fellow writer Theodore Sturgeon, Philip Farmer's "Venus on the Half-Shell" under the pseudonym Kilgore Trout nods toward Vonnegut, and then Adam's Hitchhiker's Guide to the Galaxy" nods toward 'Half-Shell's' 'definitive answer. And one more nod perhaps: half-shells come from oysters, a type of shellfish anyhow.
From HHGTTG books, Its a way of saying goodbye when you leave, particularly if your getting a golden handshake or redundancy - It means "Goodbye, I wont be back and I've got a parachute", I guess its similar "So long suckers" ... IE, Goodbye, I've got something better to do - I'm leaving for bigger and better. Although for the early retiree that usually means - slippers & daytime TV