5 Scientific Reasons a Zombie Apocalypse Could Actually Happen

From cracked.com:

We found out recently that if you try to leave a little kid in a graveyard late at night, he'll freak out. Even if you offer to leave him a gun to protect himself. Why? It's because on some instinctual level, all humans know it's just a matter of time until the zombies show up.

5 Scientific Reasons a Zombie Apocalypse Could Actually Happen | Cracked.com