Another outburst of violence aboard a plane has been caught on camera, as two passengers were seen duking it out Monday in front of stunned travelers. The incident occurred in Japan aboard a Los Angeles-bound flight in Tokyo. A flight attendant moved in, screaming, "Security!" as she tried in vain to separate the two men. Video of the altercation, captured on another passenger's cell phone, shows a few punches exchanged before things begin to settle down on the All Nippon Airways flight.