A clip of someone holding what looks like a smartphone in a Mike Tyson boxing match in 1995 has sparked hilarious debates on time-travel.
The clip shows a match between Mike Tyson and Peter McNeeley in Las Vegas.
A member of the crowd appears to be holding a device that looks similar to a smartphone.
Many internet forums have thrown up amusing theories on time-travel.
While some pointed out that the device looks more like a Casio QV-100.
Also, if you had access to time travel, you might use it for important things than to watch a boxing match.