Joe Hill, author of Horns, attempted a visit to the International Cryptozoology Museum, and then I ran across this breaking news, with a photo:

Zhang Ruifang, 101, began growing a horn last year. It is now 2.4 inches long. Another one is appearing out of the other side of her forehead. The Daily Mail.

Ah, an intriguing coincidence, after Joe Hill makes an appearance. Who could have ever imagined that?