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: 'So long, and thanks for all the fish.'
— The Hitchhiker’S Guide To The Galaxy Book (Peter Jones)
17 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 3 sitcom.
You can hear this line at 00:27:18.496 in the Blu-ray version of the TV Series.
