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Who's hugging whom? Photo showing optical illusion stumps the Internet

Try to figure out the latest optical illusion confusing the Internet, showcasing what appears to be a regular old hug — or is it?
/ Source: TODAY

After weighing in on whether #TheDress is blue or white and trying to find the image buried in a giant red dot, it's now time to figure out just who is hugging whom in this photo.

Is it some type of Cirque du Soleil embrace? Is it Regan from "The Exorcist" reuniting with an old flame?

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In the latest optical illusion leaving the masses with a headache, people are trying to get to the bottom of which person is giving the hug here.

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More than 2 million people have viewed it on Imgur, trying to figure out what is going on and whether a pair of humans may have melded into one organism. They are essentially the complete opposite of the Indian man who gave out a world-record 79 awkward hugs in a minute.

In case a vein in your forehead is now furiously pumping in exasperation, the key is the guy's white-and-black shorts.

Follow writer Scott Stump on Twitter.