An innocent photo of a little girl standing on dry grass has gone viral after people were left baffled by what they saw—or thought they saw.

Shared by Australian user Nadia Vuitton on Twitter, the image shows the girl holding what appears to be nothing—but her legs look oddly long and thin. It confused thousands, including Nadia herself, who captioned the post, “This photo confused me for a long time.” Over 11,000 people liked the tweet, and 3,000 shared it.

The twist? She’s holding a bag of popcorn that perfectly matches the color of the grass, creating the illusion that her legs stretch far below her knees.

Some users admitted it took them ages to figure it out. “I was seriously worried for the child,” one person wrote. Another added, “I thought she needed help… then I saw the popcorn bag.”

Even after learning the truth, many said their brains still struggled to see it differently. “Once you spot it, you can’t unsee it,” one person commented. “But it took me a while.”

This optical illusion is the latest in a long line of internet puzzles that remind us how easily our eyes can trick us—and just how much fun it is to figure them out.