Frederick Evan Young who is an Chewbacca impersonator lost his temper with a tour guide and decided to head but him, the trouble happened because the tour guide was not happy with the way in which the wookie impersonator was talking to a couple of female Japanese tourists, so Brian Sapir the Tour guide asked the wannabe Chewbacca not to abuse these two young women, but Frederick Evan Young did not take kindly to this and took of his head mask and then head butted him for his trouble
More info via
