Here's a possible description for the Joker movie:

"Watch the gripping origin story of the Joker, starring Joaquin Phoenix as Arthur Fleck, a struggling comedian driven to madness by society's cruelty. As he transforms into the Clown Prince of Crime, witness the birth of chaos and anarchy in Gotham City. Directed by Todd Phillips, Joker (2019) is a psychological thriller that will leave you on the edge of your seat."

Feel free to modify it to fit your style!