The moist, brownish pile on the Gehrke living-room floor is either cat food or cat shit, it was reported Monday. 'If I had to guess, I'd say it's cat food,' said Lydia Gehrke, 44, staring at the mystery heap. 'But the way Oscar's been digesting lately, cat shit is definitely a possibility, too.' Though a long shot, Gehrke noted that it could also be cat vomit. 'Whatever it is,' she said, 'it came from the cat.' 