Katie Couric won April Fools Day last night on The Late Late Show with James Corden when she threw herself down the stairs like a cheerleader in trouble. James was introducing the esteemed journalist and Yahoo! news contributor, when the curtain opened and a disheveled Couric fell down about 12 stairs causing Corden to go running from his desk to help her (in a panic). BUT….APRIL FOOLS because it was just a Katie Couric stunt double…which apparently exists. Oh that Katie!