shittymoviedetails: In Joker, Arthur suffers from a condition that causes him to laugh loudly and un
shittymoviedetails:In Joker, Arthur suffers from a condition that causes him to laugh loudly and uncontrollably, even when things are not funny. When he tries to do stand up, he has difficulty finishing a joke due to laughing too hard. This is a reference to Jimmy Fallon who the character is based on. -- source link