but those who go beyond that 24-48 hours of the angry phase without eating , who dont feed when their reanimated body needs it the most , when their brains are still receptive to life and re-living , are doomed to forever be the classic horror movie zombie ; restless , angry all the time , hungry all the time , unable to reason beyond how and where to find food , not talking save for the most rudimentary grunts or hand signals .