Get ready to have a heated debate with your friends and family, because we've got another version of the controversial white and gold/blue and black dress for you. See for yourself here:
You know the one? Back in 2015, the internet momentarily lost its mind trying to decide whether a piece of clothing was either blue and black or gold and white.
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It divided opinion, destroyed families and ruined relationships - and now this hat is going to do the same.
As outlined by the Independent, TikToker @oteliacarmen shared a video of a hat that appears to change from brown to green as she moves it around.
The interior designer posted the clip, which has been viewed nearly four million times, alongside the caption: "Why lighting should be just as important as color/material selections!!"
The TikToker said she bought what she thought was a green hat at the shop, only to then discover it turned brown when she got it home.
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Although some people tried to accuse her of editing the original video, she's posted numerous follow-ups showing it changing colour in real-time.
That includes footage of her wearing the accessory as she walks around her home - and amazingly, it appears to switch from brown to green.
In her latest clip, she attempts to explain the phenomenon, saying the colour-changing beanie is down to metamerism, a term used to describe how the colour of an item can switch under different lighting.
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Even though there's an explanation, the comments section is filled with people fearing another dress scenario.
"I can't do this again pls," wrote one user, while another said: "It's the dress all over again."
Another simply wrote: "The dress was blue."
A similar optical illusion confused as all last year when a debate about the colour of Billie Eilish's trainers kicked off on social media.
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The 19-year-old singer held a Q&A with her massive Instagram following and she was asked about the colour of that infamous dress.
Well, Billie threw another item of clothing into the mix - in the form of a pair of trainers.
The 'No Time To Die' singer said she had bought a pair of Nike Air More Uptempos, which her dad had told her were pink and white.
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However, the official listing on the Nike website showed that the colour was in fact mint green and white.
Much to Billie's shock though, many fans thought that her dad was right and the shoes were actually pink and white.
She then shared a video of them in natural light with a screenshot of the Nike website, and said: "I don't care what you think they look like, I care what they are."
Words: Daisy Phillipson