Poor Doug... A New Zealand couple who believed they had dug up the world's largest potato in their garden have had their dreams crushed after Guinness World Records wrote to say that scientific testing found it wasn't a potato after all. "Sadly the specimen is not a potato and is in fact the tuber of a type of gourd," read the email they had received from Guinness. "For this reason we do unfortunately have to disqualify the application." The official weigh-in put Doug at 17 pounds, equal to a co