The front lines of a high-stakes food fight moved recently to a sidewalk in front of a Kentucky Fried Chicken restaurant, where young volunteers from People for the Ethical Treatment of Animals tried to shock and disgust lunch-hour patrons. There was a PETA intern dressed in a bloodied chicken costume, a 22-year-old with shocking pink hair and the word "VEGAN" tattooed across her chest in gothic lettering, and campaign coordinator Ben Goldsmith with a flat-screen television strapped to his chest. "That bird is having its thigh sliced open while fully conscious," Goldsmith said, narrating a grisly video as KFC customer...