"Saturday Night Live" host David Harbour plays Oscar, a grumpy garbage man who's disillusioned with Sesame Street's crime and darkness.
The Joaquin Phoenix-fronted supervillain film generated over $93 million at the box office.
The FBI and the Department of Homeland Security issued a bulletin this week cautioning authorities to be aware of the social media postings.
This was either a messed-up moment on the set or a Phoenix prank of the highest order.
The U.S. military cautioned service members on the potential for mass shooters at screenings of the "Joker" movie following extremist posts on social media.
Director Todd Phillips' origins tale shows how a clunky comic found his criminal calling.