The Joker has long been a fictional favorite, but when one woman suggested flipping the main character's gender, Twitter was not pleased.

Read on to see what she had to say...

Last year, we were introduced to the latest Joker...

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And we were not disappointed.

The infamous criminal mastermind was this time portrayed by Joaquin Phoenix.

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Speaking to LadBible, the Oscar-winning actor explained his unique approach to the role: "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."

The movie hit our screens in October 2019.

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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Set in 1981, Fleck, who is emotionally withdrawn and is working as a party clown, lives with his mother in Gotham City - a town riddled with crime and unemployment.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, ultimately resulting in 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 into delusions, violence, and anarchy and thus, the clown-faced criminal is born.

The movie was an immediate success...

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And, to this day, it has grossed an eyewatering $1.074 billion worldwide.

It received over 200 nominations, too.

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Joaquin Phoenix alone won an Academy Award, Golden Globe, BAFTA, and a Critics' Choice Movie Award for his portrayal of the troubled Arthur Flack.

But given its dark and, at times, sensitive themes, it was always bound to whip up a bit of controversy...

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

Some even found it so disturbing, that they were unable to continue watching.

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

It seemed to have rattled many people's cages...

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 insisted that 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.

Well, these complaints didn't fall on deaf ears...

Because it was confirmed that the movie was in fact the most complained-about production of 2019.

The British Board of Film Classification broke the news.

The board, who is responsible for deciding the age rating for films and TV series across Great Britain, revealed the findings in its annual report.

The report stated that, in total, the BBFC received 149 complaints across the year...

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Fewer than half the number of complaints received in 2018. But, out of that, twenty were about Joker.

The movie was never far from controversy.

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But one woman's recent Twitter thread might be even more controversial ...

She took to Twitter to suggest the protagonist could have been female...

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And people went off.

True internet genius!

And for more from the controversial move, scroll on ...