You know, it’s not often that I’m stunned into silence by what I see on the internet, but this weeks WTF Wednesday has certainly managed to do it. Meet Chang Tzu Ping, a man from small village in China who was born with the face (consisting of a mouth with a rudimentary tongue and several teeth, a bristly patch of scalp, and vestiges of eyes, nose, and ears) of a partially formed twin attached to his own.

Chang could move the second face along with his own, and was even able to receive sensory information from it. At the age of 40, a team of doctors visited his village and performed a successful surgery to remove the twin.

I’ll let the video do the talking, but please note that some viewers may find the footage upsetting.