Can You Find the Disturbing Detail In This Photo?

Can You Find the Disturbing Detail In This Photo?

First of all, I thought maybe it was that the girl on the left somehow threw out her back from that pose, but nope that wasn’t it. I was browsing Imgur when I saw a challenge — someone posted a picture with the title, “It took me forever to find out what’s wrong here.” So naturally, being someone who can’t find the glasses on top of her head, I thought I was qualified to try and figure it out. #OMG