If you’ve ever been in a Costco on a weekend — or even a Costco parking lot — you know the store HAS to be a twisted creation of Satan. But, this is the first time we’ve had definitive proof.

Jessica Eckerdt of Queen Creek, Arizona needed a cake for her son’s sixth birthday recently, so she picked the dinosaur one out of the Costco catalog. But when she got it, she noticed something strange.

The dinosaur only had three legs, and each one looked like a big number six — so the cake said “666.”

She says: “I was extremely shocked and upset to see a demonic symbol written clear as day on my six-year-old son’s birthday cake; I was extremely surprised at Costco for allowing such an inappropriate joke.”

We’re thinking it HAD to be accidental, but maybe it was a prank by the person who designed it? Either way, Costco pulled the dinosaur cake from their catalog on Monday.