This explains the naff "Captain Crunch" section of Neal Stephenson's "Cryptonomicon". Not that you can get it where I live; it would have made sense to do a "Weetabix" section with the same theme.
(The other passage was the one about one of the characters using a computer while in prison and setting up a profusion of xterms scrolling through random files because he suspected he was being spied on using van Eck phreaking.)