The mother of all conspiracy theories:
An uncovered letter written by John F Kennedy to the head of the CIA shows that the president demanded to be shown highly confidential documents about UFOs 10 days before his assassination.
[. . .]
Alien researchers say the latest documents, released to Mr Lester by the CIA, add weight to the suggestion that the president could have been shot to stop him discovering the truth about UFOs.
Now, if we could just work "Elvis didn't really die," "Obama wasn't born in Hawaii" and "the Kennedys killed Marilyn Monroe" into it somehow, we'd really have something.
"Alien researchers"?