Jessica Eckerdt of Queen Creek, Arizona needed a cake for her son's sixth birthday, 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, each one looked like a big number six, so the cake said "666."

(Jessica Eckerdt)

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. What was supposed to be a whimsical dinosaur became something very distasteful. I was extremely surprised at Costco for allowing such an inappropriate joke be sold to an unsuspecting victim."

This 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.

This is what the cake was originally supposed to look like:

(Costco)