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The movie stars Michael Stuhlbarg as Larry Gopnik, a physics professor and family man.
Joel told ShortList: "It's a Jewish movie. Yeah. We used to call it The Jew Movie before we had a name.
"I don't know what you would call it. It's comedic, but it's not a standard Hollywood Judd Apatow comedy. It's not I Love You, Man."
His brother Ethan agreed, saying: "Yeah, we do have kids smoking marijuana and yet it's not one of those movies.
"I don't think we thought we were doing a black comedy. We just thought, 'Alright, there's this guy and a lot of bad things happen to him. And that can be funny'."
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