The Knights Who Say "Ni"

Meanwhile, King Arthur and Sir Bedevere
 Not more than a swallow's flight away, have discovered something
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 Ni! (Ni! Ni! Ni! Ni! Ni!)
 Who are you?
 We are the Knights Who Say
 'Ni'! (Ni!)
 No! Not the Knights Who Say 'Ni'!
 The same!
 Who are they?
 We are the keepers of the sacred words
 'Ni', 'Peng', and 'Neee-wom'! (Neee-wom!)
 Those who hear them seldom live to tell the tale
 The Knights Who Say 'Ni' demand a sacrifice
 Knights of 'Ni', we are but simple travellers
 Who seek the enchanter who lives beyond these woods
 Ni! (Ni! Ni! Ni! Ni! Ni!)
 Ow! Ow! Ow! Agh!
 We shall say 'Ni' again to you if you do not appease us
 Well, what is it you want?
 We want...
 A shrubbery!
 A what?
 (Ni! Ni! Ni! Ni!) Ow! Oh!
 Please! Please! No more!
 We will find you a shrubbery
 You must return here with a shrubbery
 Or else, you will never pass through this wood... Alive
 O Knights of 'Ni', you are just and fair, and we will return with a shrubbery
 One that looks nice
 Of course
 And not too expensive
 Yes
 Now...
 Go!
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 O Knights of 'Ni', we have brought you your shrubbery
 May we go now?
 It is a good shrubbery! I like the laurels particularly
 But there is one small problem
 What is that?
 We are now no longer the Knights Who Say 'Ni'!
 Ni! (sh!)
 We are now the Knights Who Say
 'Ecky-Ecky-Ecky-Ecky-Pikang-Zoom-Boing-Gumzowehzeh' (Ni!)
 Therefore, we must give you a test
 What is this test, O Knights of
 Knights Who 'Til Recently Said 'Ni'?
 Firstly, you must find...
 Another shrubbery! (Ni!)
 Not another shrubbery!
 Then! When you have found the shrubbery
 You must place it here beside this shrubbery
 Only slightly higher, so you get a two-level effect with a little path running down the middle
 (A path! A path! Ni!)
 Then, when you have found the shrubbery
 You must cut down the mightiest tree in the forest with...
 A herring!