(CNN) — The term "zombie apocalypse" has been lighting up the internet all week and has been among the top Google trends Friday morning.
On the Web's Urban Dictionary, here's definition No. 4 of zombie apocalypse: "The End of the World, when people who have died rise again in rotten corpses searching for blood and brains to strengthen them."
While we're certain the dead are not rising, the past week has seen some of the most disturbing instances of human behavior imaginable.
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