Here's the Real Disorder Behind Joker's Uncontrollable Laugh
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Joker's Joaquin Phoenix Accurately Depicts Pathological Laughing, According To Man With Disorder
Joker's Laugh Is Based on a Real Condition, the Pseudobulbar Affect
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Joker is a fictional character but his uncontrollable laughter is a real-life condition - - News from Singapore, Asia and around the world
Is the condition that causes continuous laughter in the movie 'Joker' a real condition? - Quora
Is the Joker's Laughing Condition Real?
Joaquin Phoenix Based His 'Joker' Laugh on Real-Life Ailment – IndieWire
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The Man Who Suffers From The 'Joker' Laughing Disorder' Says Phoenix's Portrayal Was Accurate