Knights Who Say Ni questions them, and Arthur admits that it is for the Knights who say "Ni!", whereupon she refuses to cooperate. Arthur then threatens to say "Ni!" to the old woman unless she helps them, and when she still refuses, begins shouting "Ni!". Bedivere has trouble saying the sacred word, which he pronounces "Nu!" until Arthur demonstrates the correct technique. As the crone shrinks back from their combined assault, they are interrupted by Roger the Shrubber, who laments the lack of law and order that allows ruffians to say "Ni!" to an old woman. Arthur obtains a shrubbery from Roger, and brings
Monty Python and the Holy Grail with candles underneath the frame (to give a heat haze). This was a low-cost method of achieving a convincing location effect. On the DVD audio commentary, Cleese described challenges shooting and editing Castle Anthrax in "The Tale of Sir Galahad", with what he felt the most comedic take being unused because an anachronistic coat was visible in it. Castle Anthrax was also shot in one part of Doune, where costume designer Hazel Pethig advised against nudity, dressing the girls in shifts. In the scene where the knights were combatting the Rabbit of Caerbannog, a real white rabbit was used, switched