There's something very disturbing about this couple's photo

At first glance, it looks just like any other standard selfie an attractive young couple might take.

But closer inspection reveals a disturbing detail in the background that has sent Twitter users in a spin.

A clue is given in the caption, apparently posted by the boyfriend: “I love my girlfriend even if she’s a Gemini.”

Much like the zodiac sign, it appears that the girl in the photograph has two faces.

She is both beaming at the camera and facing the mirror behind her.

Clearly the photograph is an elaborate Photoshop, but that didn’t stop people freaking out on social media.

There were many theories for the photo trick:

Some feared witchcraft:

The reaction was best summed up as:

The tweet clearly struck a nerve as it has since been shared more than 45,000 times.

More: Can you spot the problem with this photo?