Zombies, possible?

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This discussion is pure speculation, with really no facts. A discussion about the undead. We've all seen the movies. The unstoppable zombies, with endless hordes spreading through the city/world. But could this happen in real life? Probably not, but it's fun to discuss. Anyway, it seems that there's one type of zombie that rises out of their graves for some reason (or no reason at all) and the types that are called "Infected" and have a virus but are really zombies after all. Do you think it's really possible for zombies to exist? By the way, what would you do if there were zombies?