Paul McCartney performing at Citi Field. (July 17, 2009)

Paul McCartney performing at Citi Field. (July 17, 2009) Credit: AP

The "Paul is Dead" craze began 42 years  ago today  -- on Oct. 12, 1969 --  when a radio DJ played the Beatles' "Revolution #9" backward. Here's McCartney in 2009 telling David Letterman how he reacted to the news that he had died: 

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