At first glance, this photo shows a group of friends posing on a sofa with drinks.
But on closer inspection, there is something very confusing about it.
The young woman in the middle of the picture appears to have no legs.
The snap, thought to have been taken in the US, seemingly shows six friends relaxing on the sofa - but just five pairs of limbs.
It has left the Internet baffled , with hundreds of users desperately trying to work out where the woman's missing legs are.
Most people believe the photo is a remarkable optical illusion , with the sixth pair of limbs hidden behind other women's legs.
However, users can't agree where they actually are.
The puzzling photo was posted on Reddit by user 'jr0d7771' on Christmas Eve, with the caption: "Find the middle girl's legs.
It has since been commented on a whopping 400 times, with one person writing: "The second girls legs are behind first girls legs. I think."
Another user remarked: "I think so too," while a third said: "I actually think the first girl has get legs draped OVER the second girls legs (sic)."
However, a fourth disagreed, writing: "Her left leg is behind #2. The other leg is under #4's leg. You can see that #4 has two different shoes on."
It is not the first time a picture has confused the web.
Earlier this month, a photo of six women on a beach left people baffled.
At a brief glance, the image looks like a typical snap of a group of friends on holiday, posing in sunglasses and bright bikinis.
But at a second look, the women look alarmingly similar.
This is, in fact, because a social media trickster has photoshopped the face of a man behind them onto each one of them.
The hilarious picture was widely shared online, with one user claiming it took them nine hours to figure out what was wrong with it.