The Knights Who Say "Ni"

Meanwhile, King Arthur and Sir Bedevere Not more than a swallow's flight away, have discovered something 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! 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!