Where is the script below from?

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ARTHUR: O Knights of Ni, we have brought you your shrubbery. May we go now?

HEAD KNIGHT: It is a good shrubbery. I like the laurels particularly,... but there is one small problem.

ARTHUR: What is that?

HEAD KNIGHT: We are now... no longer the Knights Who Say 'Ni'.

KNIGHTS OF NI: Ni! Shh!

HEAD KNIGHT: Shh! We are now the Knights Who Say 'Ecky-ecky-ecky-ecky-pikang-zoop-boing-goodem-zu-owly-zhiv'.

RANDOM: Ni!

HEAD KNIGHT: Therefore, we must give you a test.

ARTHUR: What is this test, O Knights of-- knights who till recently said 'ni'?

HEAD KNIGHT: Firstly, you must find... another shrubbery!

[dramatic chord]

ARTHUR: Not another shrubbery!

RANDOM: Ni!

HEAD KNIGHT: Then, when you have found the shrubbery, you must place it here beside this shrubbery, only slightly higher so you get the two-level effect with a little path running down the middle.

KNIGHTS OF NI: A path! A path! A path! Ni! Shh! Knights of Ni! Ni! Ni! Shh! Shh!...

HEAD KNIGHT: Then, when you have found the shrubbery, you must cut down the mightiest tree in the forest... with... a herring!

[dramatic chord]

KNIGHTS OF NI: A herring!

ARTHUR: We shall do no such thing!

HEAD KNIGHT: Oh, please!

ARTHUR: Cut down a tree with a herring? It can't be done.

KNIGHTS OF NI: Aaaaugh! Aaaugh!

HEAD KNIGHT: Augh! Ohh! Don't say that word.

ARTHUR: What word?

HEAD KNIGHT: I cannot tell, suffice to say is one of the words the Knights of Ni cannot hear.

ARTHUR: How can we not say the word if you don't tell us what it is?

KNIGHTS OF NI: Aaaaugh!

HEAD KNIGHT: You said it again!

ARTHUR: What, 'is'?

KNIGHTS OF NI: Agh! No, not 'is'.

HEAD KNIGHT: No, not 'is'. You wouldn't get vary far in life not saying 'is'.

KNIGHTS OF NI: No, not 'is'. Not 'is'.

BEDEVERE: My liege, it's Sir Robin!
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