The title of the Knights Who Say Ni, from the movie "Monty Python and the Holy Grail". When the speaking of a sacred word is directed at a person, that person feels pain. The three sacred words are "Ni", "Peng", and "Nuwong". There is another word that is considered by some to also be one of the sacred words. It does not have an official spelling, but it sounds something like "echy-echy-echy-echy-kapang-zu-boing-zow-zow".