'Joker': Joaquin Phoenix reveals how he mastered the iconic laugh of Batman's arch-nemesis

Joaquin Phoenix says he based signature laughter of iconic DC villain Joker on a neurological disorder kwn as Pathological Laughter and Crying (PLC).

condition is characterized by inappropriate and involuntary laughing and crying due to a nervous system disorder.

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Phoenix, who is set to star as Clown Prince of Crime in eponymous film, said he watched videos of people suffering from condition as part of his preparation.

"I started (with laugh). I watched videos of people suffering from pathological laughter, a neurological disorder that makes individuals laugh uncontrollably," actor told Italian magazine Il Venerdi.

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Phoenix follows likes of Jack Nicholson, Mark Hamill, Heath Ledger and Jared Leto with his portrayal of Joker in Todd Philips-directed movie.

Also featuring Zazie Beetz, Robert De Niro, and Marc Maron, 'Joker' will have its world premiere at Venice Film Festival later this month. It releases worldwide in October.

Watch trailer here: