The outtake isn’t over-the-top in the way that makes you laugh, instead it feels like you’re watching somebody have a minor meltdown, which is always awkward.
It’s also a pretty significant change in tone for the interview as a whole.
For the most part everything up to that point is your standard late night interview material.
It’s an odd sort of gag because, much like the stuff Phoenix was doing in public for I’m Still Here, it’s not actually all that funny.
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Joaquin Phoenix on Playing Joker + Exclusive Outtake