Folie A Deux, also known as shared psychosis, is a rare psychiatric disorder in which two individuals share a delusional belief. There are many synonyms for this condition, such as shared delusional disorder, shared psychotic disorder, or induced delusional disorder. Folie-imposee and induced psychosis are other terms that describe this condition. The condition can happen between siblings, couples or close friends, and is usually triggered by stress or trauma. The shared delusion can take on many forms such as a belief of being followed or a conspiracy against them. Treatment includes medication, psychotherapy, and social support. Folie a deux is still a complex and interesting disorder for psychiatrists and researchers to understand and explore.