Joker 2: Photos, Cast, Plot, Release Date
More Behind-the-Scenes "Joker Folie à Deux" Photos Seemingly Tease Lady Gaga's Harley Quinn
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Folie à deux is a French term for a rare mental disorder that's also known as shared psychotic disorder. According to the National Library of Medicine, folie à deux occurs when the delusion of one patient who suffers from a psychotic disorder is transmitted in its entirety, or in part, to someone else. The condition usually occurs with people who are in close relationships.