Pakadali pano, Joaquin Phoenix ndi amodzi mwa ochita masewera olimbitsa thupi kwambiri padziko lapansi, koma kuwonjezera pa luso lapadera, limadziwika kwambiri chifukwa cha mawonekedwe ake ovuta komanso mtundu wa njira yogwirira ntchito. Poyankhulana kwambiri ndi magazini ya GQ, Phoenix adanena kuti panthawi yojambula "Joker" anali ndi mwayi wokhozanso kuchitika ndi Robert de Niro. Zomwe zimayambitsa mkanganowu zinali kuti ku Phoenix kumachitika koyambirira kowerengera. Sizinazikonde. De Niro, yemwe adatembenukira kwa Woyang'anira Towd Phillips ndi mawu otere:
Muuzeni [Phoenix] kuti ndi wochita sewero ndipo ayenera kukhalamo ... Ndikufuna kumva m'chipinda chimodzi ndikuwerenga script.
Phoenix adayankha izi:
Nditakhala ndi awiri, sinditenga nawo gawo pa Tweet.
Monga mukuwonera, wothandizirana wa njira yapamwamba ya de Niro anagwirapo ntchito nthawi yomweyo ndi Phoenix, koma zotsatira zake, ochita sewerowa adayambanso kunyengerera. Phoenix adati adavomera kuti agwire Tweet mu ofesi ya de NRO. Zowona, pakachitika, Phenix sanamvebe m'mbale yake, osanena kuti, koma akupukutira zojambula zake. Pambuyo pake, de Niro anapempha Phoenix kupita kukalankhula zachinsinsi, koma anakana. Nthawi yomweyo, Phoenix adazindikira kuti anali wokonda kwambiri mnzake wamkulu kuyambira pomwe adayamba kulima "ku Martin Scorsese.
Udindo wa Udindo wa "Joker" adabweretsa ma phoenix a phoeenix pa mphotho yamphongo ya munthu, kuphatikizapo oscar mu kusankhidwa kwa "Amuna Amuna Aanthu." Ndi de Niro, adalandira chiphaso chotchuka kawiri - chotsogolera ng'ombe "(1981), komanso udindo wachiwiri mu" Mtanda bambo 2 "(1975).