While you'd think that kids films are meant to be all innocent to cater for a younger audience, there are often some hidden meanings.
Some only begin to unravel them years after the film's release, leaving audiences shocked once they've made the discoveries all these years later.
One TikToker had that exact moment after she discovered what what '23-19' from Monsters Inc meant.
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The woman, who goes by username @iamfyiya on the popular video platform, posted her discovery in 2021 shortly after watching the classic Pixar movie.
She noted the iconic scene where monster George Anderson comes out of a child's room with a sock stuck on his back.
Yep, we all know it, right?
As poor George comes out of the room thinking it's a job well done, one of his colleagues shouts 'we have a 23-19,' before an emergency response team appear out of nowhere and shut everything down.
Unfortunately for George, he has all of his fur shaved off in a bid to decontaminate him.
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After watching this scene, Fyiya, a musician from Ireland, was left shocked after making a discovery.
Taking to TikTok, Fyiya said: "Oh my god. I was today year's old when I realised when I used to watch Monsters Inc I used to be like 'what the hell is a 23-19?'
"The 23rd letter in the alphabet is W and the 19th letter is S. Standing for white socks. Yep."
Back in 2021, the short clip went viral on TikTok, with many in the same boat that they were completely unaware of the meaning behind '23-19'.
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Commenting under the video, one TikTok user wrote: "What????? That's so cool I did not know that either."
A second added: "You're like a detective. Why didn't I crack the code?"
While a third penned: "That just blew my mind..."
Others comments pointed out that Pixar - the makers of the film - have references to '23-19' in a lot of their projects.
That is because the number duo is the studio number that all producers start off in.
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To be honest, there has been many questions that have come out of Monsters Inc, including what on earth Boo's parents were doing during the film.
Well, the film's director and Pixar's chief creative officer, Pete Docter, addressed just that in 2020.
Speaking to the Huffington Post, he said: "This is one of these questions that we asked ourselves and we went through a lot of different machinations of writing scenes.
"We didn't actually board any, but we felt like, OK, the audience doesn't need to know this because Sulley doesn't know. And we're with Sulley. So who cares?
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"Whatever her parents think, we're just going to ignore that. And it turned out pretty OK."
Featured Image Credit: TikTok/@iamfyiya / PixarTopics: TV And Film, TikTok