From Lauren Davis’ “Delusion or Alien Invasion? Disorders That Make Life Seem Like Scifi” (io9: 27 September 2008):
Capgras Delusion: You believe a loved one has been replaced with an exact duplicate.
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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.
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Alien Hand Syndrome:Your hand seems to have a will of its own.
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Alice in Wonderland Syndrome: You perceive objects as much larger or smaller than they actually are.
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Fregoli Syndrome: You believe that multiple people in your life are actually a single person in disguise.
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Jumping Frenchman of Maine Disorder: You obey any order shouted at you in a commanding voice.
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Delusional Parasitosis: You believe that you are infested with parasites.
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Cotard Delusion: You believe you have died and that your body is rotting and/or your soul is gone.