Wang the human unicorn

"Perhaps the most famous of all the horned marvels was Ripley’s ‘Human Unicorn’. In 1930, a Chinese farmer from Manchukuo was discovered by an expat Russian banker. The Russian was able to take a picture of the man and he sent the snapshot off to Robert Ripley of ‘Believe It Or Not!’ fame. Known only as Wang, or sometimes referred to as Weng, the farmer was normal in every respect except fot the fact that he possessed a fourteen-inch spire-like horn growing from the back of his head.
Ripley offered a huge cash reward to anyone who could produce Wang for an appearance in his Odditorium. However Wang disappeared from the public eye in the early 1930′s and was never heard from again.
The causes for human horns are varied. Most often it is attributed to benign calvarial tumours, such as osteomas, and an aggressive variant of a condition known as cornu cutaneum. It is important to note that ‘horns’ can grow anywhere on the human body but that the condition manifesting on the head only is a rarity."