8. Head Injury
Another from the world of possible cop-outs yet completely possible is a head injury. Like augmented reality, you do not always have to have real zombies to make people believe that real zombies exist. If someone were to be injured in the head, their brain will have several issues that will need to be addressed. This could include dizziness, disorientation, blurred vision, confusion, memory loss, hallucinations, convulsions, and so much more.
Imagine for a second if we knew just the spot to hit someone and then abused this person to a point where they believe a real zombie apocalypse is taking place. Remember, in order for something to qualify as a zombie, it must “appear” as a member of the undead. It could even be a person of strange behavior. Thus, you could clearly make someone with a head injury believe something is happening when it is clearly not.