DB Cooper was Bobby Fisher. Fisher needed the money to buy a set of chess pieces carved from narwhal penises that had been offered him by an Uzbek arms dealer. That's the only reason he later became world champion.
When Spassky was 2-0 up against Bobby, Fisher insisted on playing with the narwhal pieces. Spassky agreed, not knowing what he was supposed to play with. As soon as the Soviet champ opened match #3, Fisher whispered across the table: "You just stroked a fish dick, fag!" Spassky was so shocked when he learned about his pawns' true nature, that he completely fell apart, eventually losing his title to the American.
Bobby took the secret to his deluded grave.But I was able to reconstruct the story 40 years later from cryptic messages on Miley Cyrus's Twitter page.