The Mandela Effect has struck again and this time, it concerns Ancient Egypt and its most famous attraction - the Great Pyramid of Giza.
Heading back some 4,600 years, the UNESCO World Heritage Site was built over the course of around 20 years.
With up to 25,000 people taking part in the monumental build to serve as the tomb for the pharaoh Khufu, it is one of the Seven Wonders of the Ancient World.
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And despite its incredible time standing on Earth, the Egyptian landmark still in remarkably good condition on the outskirts of the modern city of Giza.
The Giza Necropolis has become the stuff of legend, with conspiracy theorists also getting involved suggesting their completion is something otherworldly.
This is despite scientists thinking they've finally cracked it when it comes to how they were built.
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Now, the Mandela Effect has taken ahold of the ancient site. And it's actually based on real life.
For those unaware, the Mandela Effect is a social phenomenon where people misremember a significant event or detail. It can be about pretty much anything.
Taking to the Glitch in the Matrix, Mandela Effect & Time Slips group over on Facebook, one user wrote: "The latest Mandela Effect has me scratching my head.
"Apparently, the Great Pyramid of Giza has eight sides now."
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There's nothing 'apparent' about it. Because it actually does.
World leading Egyptologists such as I. E. S. Edwards and Flinders Petrie have both written about this in their studies, with Petri noticing hollow lines down the centre of each of the apparent four sides.
And Edwards wrote that the sides are 'sloped slightly inwards towards the centre of each course, with a result that a noticeable depression runs down the middle of each face; a peculiarity shared, as far as is known, by no other pyramid'.
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Academic studies back this up, with researcher Akio Kato writing in the Archaeological Discovery journal that the Great Pyramid of Giza is in fact a 'concave octagonal pyramid rather than a standard square pyramid'.
Experts in the field state that it is something more easily visible form the skies with it tough to spot from the ground, unless in the correct lighting.
Responding in the Mandela Effect group, one person said: "Nooo... that's weird."
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A second refused to admit it, labelling it an 'error' and saying: "Nope! It has four."
And another wrote: "It always had, the humans got the math wrong on placing the measuring spots! If Aliens had built it, it would be perfect!"
Clearly it is a thing some people knew while others were totally oblivious. Either way, the eight sides is something noticed by experts in the field for decades, so maybe we should listen to them.
Why eight sides? We still don't know. The mysteries of Ancient Egypt continue.
Topics: History, World News, Technology, Science, Facebook, Social Media
Tom Earnshaw