Footage has resurfaced from a 1995 Mike Tyson fight that seemingly shows a fan filming the bout on a smartphone - five years before the first camera phone was released.
As Tyson prepares to fight Peter McNeeley in Las Vegas, a spectator in the front row can be seen pointing what looks like a camera phone at the ring.
However, the first camera phone wasn't available for another five years, coming on the market in 2000.
The discovery has prompted a number of conspiracy theories including one suggestion that the fan is in fact a time traveller returning from the future to watch his favourite boxer.
The video, that has been viewed over three million times, was first published on YouTube in September 2015 but has resurfaced again as people seek to solve the mystery. The video has been
JammyBantam, who posted the video on YouTube, told Mail Online: "I dunno if it's a time traveller or not, but no one can explain what camera it is; a QV-100 doesn't have a silver bit on the right, and this camera doesn't seem to have a black line under the lens”.
However, Scott C Waring from UFOSightingsDaily.com was less uncertain.
He wrote: "What we have here is a time traveller coming back to watch their favorite fighter and sitting in the front row seats."