Hats have evolved from being integral to protect against the elements to having ceremonial significance and now primarily as a fashion accessory. We discuss hats, hat pins, magic hats, significant hats and mercury poisoning (obvs). We journeyed from the oldest hat in circa 3500 B.C. through to 9th century Scandinavia, 19th century North America, 20th century England and beyond as we uncover some of the interesting stories and facts we came across in our research.