THIS outdoor snap of pals enjoying a whisky contains not three but four people - but can you see them all?

The mind-boggling optical illusion emerged on Twitter at the weekend.

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At first it looks like one man in a kilt and hat clinking miniature whisky bottles with two friends, whose arms are outstretched.

But there are four drinks - suggesting there is a fourth person in the picture. So can you see them?

We'll give you a clue - the bag behind Mr Kilt is not a person.

Uploading the Reddit snap to Twitter, a social media user said: "My brain refuses to believe there are 4 people in this photo."

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And internet users were left stumped trying to find the fourth person.

One pleaded: "I'm confused... why are there only "3" arms, yet "4" bottles?"

Another wrote: "Me looking at this photo asking myself if im blind or if theres something more going on here."

Meanwhile, a third simply gave up and said: "Nope, canny see it."

It's only on a much closer inspection that you can spot the camouflaged sleeve attached to a blue gloved hand at the left-hand side of the picture.

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And, trust me, once you spot it you will never be able to unsee it.

After a close examination, one Twitter user said: "I zoomed in, stared at those blue fingers for a good 30 seconds trying to figure it out.

"Multiple solutions went through my head. Maybe it's a child underneath the cluster of hands.

"Maybe somebody is standing behind the guy in orange. Then I saw it."

Another joked: "This is literally the first time I've seen camouflage work."

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Can you spot the fourth person drinking whisky in this mind boggling optical illusion? - The Sun