It's only been a matter of days since the Joker movie hit screens, and already it's stirring up controversy.

The psychological thriller details the origin story of Batman's archnemesis, The Joker, and how he became the notorious villain he is.

While some agree that its portrayal of mental health could have been executed better, others have commended it for every other aspect. And one particular part of it seems to have stood out for fans all around the world and it may or may not involve the legend that is Batman.

The Joker is one of the most infamous villains in the comic book world.

The supervillain made his debut in the Batman comic books in 1940 and has since become one of the most notorious faces of the franchise.

He was originally meant to be killed off during his initial appearance.

But plans changed and he stuck around to become Batman's archenemy.

He was most famously brought to life by Heath Ledger in 2008.

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The Dark Night was a box office smash hit, receiving rave reviews and grossing over, a staggering, $1 billion in revenue.

The movies the Joker appears in seem to garner worldwide success.

Seems fans of the franchise can't get enough of the psychopathic anti-hero.

So, when it was announced he was getting a movie of his own...

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...fans were elated. In fact, there was so much buzz around its release that the movie bagged the Golden Lion prize at the Venice Film Festival in September.

This time, the infamous criminal mastermind is portrayed by Joaquin Phoenix.

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Speaking to Ladbible, the Oscar-nominated actor explained: "I thought it was important for it to be its own thing, to be its own interpretation. What's interesting about this character is that everybody can interpret it however they want."
"Even with this film, I think the audience gets to interpret the character and what drives him, in a way that I think is unique for a lot of films. I mean it really asks the audience to participate, and I think that's interesting."

The movie hit screens earlier this month.

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Directed by Todd Phillips, Joker tells the origin story of, you guessed it...the Joker (or Arthur Fleck as he's known as in the movie), and how he evolves into the criminal mastermind we all know him as.

Arthur Fleck is a lonely, failed comedian.

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Set in 1981, Fleck, who is working as a party clown, lives with his mother in Gotham City - a town full of crime and unemployment.

Fleck also has a neurological disorder that causes him to laugh at inappropriate times.

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Due to this, he often lands himself in bad situations. And of course, he finds himself on a huge downward spiral.

He becomes an outcast of society.

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Fleck is isolated, bullied, and lonely.

The movie chronicles his descent into madness.

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Soon enough, Fleck's life becomes rife with out-of-control delusions, violence, and anarchy and thus, the clown-faced criminal is born.

The movie has solicited some extreme reactions.

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From rave reviews to full-blown outrage, the dark movie has debuted to extremely mixed emotions.

The movie has already broken a major record...

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Over the weekend alone it raked in an eye-watering $93.5 million at the US box office - although we aren't entirely surprised, given the huge anticipation in the lead up to its release.

But given its blatantly dark and, at times, sensitive themes, it was bound to whip up some kind of controversy.

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And it sure didn't disappoint, with many people slamming the movie for its representation of mental health and "glamorization" of violence.

Theatre-goers have also been left outraged by a particular song used in the movie...

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Convicted pedophile, Gary Glitter's 1972 "Rock and Roll Part 2" is used in one scene. Glitter was jailed in 2015 for a number of sexual assault offenses, including one count of raping a 13-year-old girl, so it's no wonder so many viewers were disgusted.

The movie is apparently so disturbing, it has been leaving viewers unable to continue watching.

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Several people took to Twitter to call out the "horrible" movie, saying how they've been left terrified while watching.

It seems to have rattled many people...

While some have praised the movie for shedding light on the struggles of living with a mental illness, others didn't agree and think the film's portrayal did more harm than good.

Several have been saying the movie should have come with a trigger warning.

Like this user, who cited the graphic shooting as one of the main reasons why they feel a trigger warning should have been placed at the start of the movie.

Others cut the movie more slack.

While many admitted that the movie was without a doubt dark and disturbing, some say Joaquin Phoenix's performance deserved an Oscar.

I demand that someone give that man an Oscar!

The word on the street is that Pheonix is a shoo-in for an Oscar, people saying his portrayal of the Joker really brought back that rawness to the character. And so began the comparison memes to Jared Leto who is on the receiving end of some well-deserved criticism for his previous role as the Joker.

But that's not the only thing fans are talking about.

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A debate has broken out online with some fans claiming that there is a powerful reference to Joker's arch-nemesis, Batman.

"Where?" I hear you ask.

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For those of you that haven't noticed, think back to the opening scene of the film where we first see Arthur Fleck applying his clown make-up as he gets ready for work.

Some fans believe that the lighting and setting have been manipulated to show us, Batman...

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If you still don't get it, let me explain. The two white lights above Fleck look very similar to Batman’s iconic glowing eyes. Then, Joker’s pale face is used to represent his mouth and the surrounding area is the rest of Batman's stance. Pretty cool, right?

There have been mixed opinions on this...

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But it doesn't really matter. Reading fan theories about this masterpiece is probably one of the best outcomes of the film.

And if you still haven't seen Joker, then watch the full trailer below:

But if the thought of watching the dark thriller isn't really your style, keep scrolling to read everything coming to streaming giant, Netflix this month. Maybe you'll find your next favorite binge-watch...