What's odd about this picture of friends at the beach?

At glance, this picture looks just like a group girls posing on a beach day out together.

But, look a little closer, and there's something definitely a little odd about.

See also: Are these flip flops black and blue or white and gold?

See also: Can you spot the camouflaged octopus on the ocean floor?

Spotted it yet? No? Here's a hint: It's got everything to do with the random guy standing behind them.

Yep, one social media user decided to photoshop his face onto the bodies of all the girls in the picture - and this is the result.

According to the Daily Mail, a host of Instagram users just couldn't spot it and spent hours trying to see what was wrong with the pic.

One user wrote: "It took me 9 hours to figure it out."

The picture comes not long after another beach image had the internet very confused.

The photo of a pair of Havaiana flip flops left everyone divided over whether they were blue and black or white and gold.