io9
Delusions and neurological disorders have the ability to radically alter your perception of reality. But the effects of many of these disorders resemble the consequences of an alien invasion, a government conspiracy, or a scientific experiment gone awry. So how can you determine if you're delusional or in a work of science fiction? It may be impossible to tell until it's too late.
Capgras Delusion: You believe a loved one has been replaced with an exact duplicate.
If it's not a disorder, you may be in: Invasion of the Body Snatchers, The Stepford Wives, Imposter.
Lycanthropy: You believe you have become an animal or have the power to transform into an animal.
If it's not a disorder, you may be in: The Fly, Teen Titans, X-Men.
Reduplicative Paramnesia: You believe that a place or location has been moved to another site, or has been duplicated and exists in two places simultaneously.
If it's not a disorder, you may be in: Dark City.
Alien Hand Syndrome:Your hand seems to have a will of its own.
If it's not a disorder, you may be in:The Hands of Count Orlac, Mad Love, Body Parts.
Alice in Wonderland Syndrome: You perceive objects as much larger or smaller than they actually are.
If it's not a disorder, you may be in: Attack of the 50 Foot Woman, Fantastic Voyage, Innerspace, Them!
Fregoli Syndrome: You believe that multiple people in your life are actually a single person in disguise.
If it's not a disorder, you may be in: A Scanner Darkly, "Future Imperfect" (Star Trek: The Next Generation).
Jumping Frenchman of Maine Disorder: You obey any order shouted at you in a commanding voice.
If it's not a disorder, you may be in: Dune, Star Wars.
Delusional Parasitosis: You believe that you are infested with parasites.
If it's not a disorder, you may be in: Alien, Slither, The Faculty.
Cotard Delusion: You believe you have died and that your body is rotting and/or your soul is gone.
If it's not a disorder, you may be in: Anything by George Romero.
