Capgras Syndrome, also known as “Imposter Delusion” is a rare psychological condition in which the affected person holds the belief that a close loved one has been replaced by an identical imposter.

Walking Corpse Syndrome, also know as Cotard's Delusion or Cotard's Syndrome, is a rare mental disorder in which the affected person holds the delusional belief that they are dead and/or actively rotting away.