This hidden detail about Joker's suit makes you rethink how you watch this movie

Back in 2008, The Dark Knight introduced us to Heath Ledger's version of the Joker, but Christopher Nolan intentionally stayed away from revealing his backstory. It was supposed to create a mystery about this anarchic villain. We learned about him only from his words or actions. However, Todd Phillips's Joker took a different approach and became an origin story. In his film, the character was not standing against a caped vigilante. Instead, he decided to fight against those who wronged him.

Joaquin Phoenix played Arthur Fleck as a party clown and an aspiring stand-up comic who is often ignored and ridiculed. He craves love and attention but rarely receives it. His neurological condition also keeps him at bay with almost everyone around him. So, the constant social alienation takes a further toll on his mental health. Although a clown by profession, Arthur accidentally becomes the "Joker" after popular comedian Murray Franklin reduces him to a laughingstock.

Eventually, Arthur gets invited to Murray's talk show as a clown that people do not take seriously. However, his roughly five-minute talk show appearance takes a tragic turn.

Disclaimer: This article contains spoilers for 2019's Joker. Readers' discretion is advised.

The interview scene in the film is Joker showing "his true colors"

Arthur Fleck appears on Murray Franklin's show after a tragic incident. While on a subway ride, some corporate employees tease him for his clown makeup. He shoots two of them and murders the third in retaliation. People turn this clown-like figure into a hero because he kills the employees of a billionaire running for the mayoral position. However, on the show, Murray portrays Arthur as a joker who flops during one of his stand-up performances.

It hurts Arthur even more because Murray is his idol. Imagine being trolled by the person you have revered for your whole life. That's what Arthur feels. Still, he shows up on Murray's talk show upon an invitation. Murray assumes that he is talking to a naive comic who doesn't know a thing about comedy. He invites Arthur mainly to make fun of him, since it becomes popular to make fun of him. However, Arthur has an ulterior motive for his appearance.

Arthur wants to show that he genuinely stands up against people like Thomas, who have deprived him and others of decent lives. Murray deems it as a cry out of self-pity. He believes Arthur wants to be a cult-like figure that symbolizes rebellion. So, Arthur shoots Murray. Then, he walks up to the camera where the lights are of different shades. Instead of the warm yellow tone like before, it is cold blue. That moment quite literally depicts the Joker showing his true colors.

For this appearance, Arthur wears a predominantly red and yellow suit. Red and yellow are opposite colors (on the color spectrum) to green and violet, which are the usual colors associated with this Batman villain's suit. However, when right next to the camera, Arthur's suit changes colors, from red to violet and from yellow to green. So, in that moment, Arthur demonstrates that he is the anarchic Joker, who will not be ridiculed anymore.

More details about Joaquin Phoenix's Joker

Before the talk show appearance, Arthur learns that he is Thomas Wayne's son and Bruce's half-brother. Thomas abandoned Arthur's mother, so she had to live with an abusive man. On the other hand, Thomas is the billionaire mayoral candidate whose employees ridiculed him. That primarily gets Arthur riled up on the show.

Joaquin Phoenix's Arthur attends the show of his idol, Murray Franklin, even after Murray ridiculed him. This part of Joker's arc is eerily similar to Martin Scorsese's The King of Comedy, and Robert De Niro, who then played an aspiring comedian, stars as the popular host on the other side of the table.