The zombies are coming!" the Homeland Security Department says. Tongue firmly in cheek, the government urged citizens ... to prepare for a zombie apocalypse, part of a public health campaign to encourage better preparation for genuine disasters and emergencies. The theory: If you're prepared for a zombie attack, the same preparations will help during a hurricane, pandemic, earthquake or terrorist attack. The federal Centers for Disease Control and Prevention last year first launched a zombie apocalypse social media campaign for the same purposes. Emergency planners were encouraged to use the threat of zombies - the flesh-hungry, walking dead - to encourage citizens to prepare for disasters. A few of the government's suggestions tracked closely with some of the 33 rules for dealing with zombies popularized in the 2009 movie "Zombieland," which included "always carry a change of underwear" and "when in doubt, know your way out."