Season eight of Supernatural featured monsters known as Leviathans. Their faces were actually just giant jaws, and when they opened their mouths they were frightening and gross. BtVSFigs forum user willowswalok thought it would be freaky to cosplay as a Leviathan for London Comic Con. He sculpted the mouth mask and teeth onto a mannequin head, made a mold, and cast the mask in latex. He painted it with skin tones (the texture looks natural!) and used a clear elastic strap to keep the mask on his head. The finishing touch was using black fabric on the interior of the mask so no one could see his face. I would have been creeped out if I came across this costume at a convention.