While most of us have wished for a time machine at one point or another, we're sensible enough to know that time travel doesn't exist.
Well according to one claim stemming from a 1937 video, conspiracy theorists think it appears to show a woman talking on a mobile phone long before they were ever invented.
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For clarity's sake, the first mobile phones made their way into the world in the 1980s, which is around 50 years after this video was filmed.
The black and white footage features a busy scene that shows a group of women walking down a large set of stones stairs.
However, one woman stands out not only because she is not wearing a headscarf like most of the others, but because she appears to be talking on a mobile phone.
According to theorists, the woman doesn't just appear to be holding a mobile phone either, she is apparently talking too, which has got some people speculating that she's a time traveller after the footage was reposted to YouTube by the conspiracy theorists Alien Disclosure Group.
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While it's not known where the film was shot, conspiracy theorists have claimed it is from 1937.
Viewers had a lot to say about this apparent proof that time travel exists.
One wrote: "There is no question that she is speaking as she descends the stairs while holding a small object next to her ear.
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"We can only wonder who is she speaking to and and what exactly is she speaking in!"
Agreeing with the mobile phone theory, a second viewer added: "Yes u can actually see she holding one [sic]."
However, a second viewer appeared to debunk the theory that it was a mobile phone because it would have been impossible to get a signal in 1937.
They wrote: "I guess the phone signal traveled through time also like what satellite was transmitting the signal... it's a walkie talkie they used them in the factory she had worked at. That's where all the girls are leaving from."
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"Curious," agreed another viewer before questioning: "Wonder What network is she connected to [sic]."
The resurfacing of this footage comes shortly after conspiracy theorists also spotted a 'mobile phone' in a painting that's 150 years old.
Featured Image Credit: YouTubeTopics: News