A customer shot and critically injured a worker at a KFC in St. Louis over a lack of corn. The man was placing an order in the eatery’s drive-thru lane Monday evening when employees informed him the restaurant was out of corn, police said. The man grew enraged and threatened the employees over the drive-thru speaker box at the fast food joint located at 5020 Delmar Blvd. in the Central West End neighborhood. He then drove up to the drive-thru window with a handgun, according to cops. A 25-year-old employee went out to speak with the man and came back...