The sound comes from Monty Python and the Holy Grail, released in 1975, in the scene with the Knights Who Say Ni. Led by a towering knight played by Michael Palin, the group terrorises King Arthur by shouting the word Ni and demanding a shrubbery as payment to pass. The scene became one of the film's most quoted moments, repeated by fans for decades, quoted in classrooms and conventions, and later clipped and shared online as a short reaction sound.