It's hard to believe, but this is the real deal, as documented by scientists and reported in the UK Daily Mail: after a suicide attempt, a man named Graham Harrison awakened with the belief that he had come back as a zombie – the result of an actual illness nicknamed “Walking Corpse Syndrome.”
Cotard's Syndrome, named after the French neurologist who first diagnosed it in the late 18th century, is a legitimate form of delusional psychosis that causes those suffering from it to believe they are dead, or that parts of their bodies are rotting or missing. The first documented case dates back to 1788, and there have only been a few hundred reported cases since then, including 57-year-old Harrison.
"I just got annoyed,” Harrison said after recovering from his nightmarish ordeal nine years later (through intense psychotherapy and drug treatments). “I didn't know how I could speak nor do anything with no brain, because as far as I was concerned, I hadn't got one.” He eventually began roaming the local cemetery, since he felt most at home there. “It was the closest I could get to death,” he said.
The greatest danger facing Cotard's sufferers is actually starvation, since many of them think they no longer need to eat. So far there are no documented cases of these people craving human flesh... not yet, anyway.