Zombies were inadvertently invented by a nameless stray dog, thousands of years ago.
I'm not kidding.
Been Around Since...
"I shall raise up the dead and they shall eat the living... I shall make the dead outnumber the living."
Where do you think the above line comes from? George Romero? That one movie about the army of Nazi Zombies?
It's from an ancient Babylonian epic that was written five thousand years ago. It's one of the oldest written works we know about. So forget about Night of the Living Dead or even the old Haitian Voodoo zombie priests. Zombies go way back. There's even a zombie army in the freaking Old Testament.
Which brings us to that random stray dog.
Experts think that back before we even had such a thing as stories or even language, the whole idea of resurrected undead came when some dog sniffed some rotting meat a few inches under loose soil: a recently-buried body. The dog digs up a hand, chews on it a bit, then runs off when he hears people coming. The people show up, see a single hand jutting up from the dirt and run like hell. "He's coming back! SHIT!"