The Knights of Ni (from Monty Python and the Holy Grail)

 Voice over:   Meanwhile, King Arthur and Bedevere, not more than a
               swallow's flight away, had discovered something.

 Knights of Ni:
               Ni!  Ni!  Ni!  Ni!  Ni!  Ni!
 Arthur:       Who are you?
 Knight of Ni: We are the Knights who say.....   "Ni"!
 Arthur:       (horrified) No!  Not the Knights who say "Ni"!
 Knight of Ni: The same.
 Other Knight of Ni:
               Who are we?
 Knight of Ni: We are the keepers of the sacred words: Ni, Ping, and Nee-womm!
 Other Knight of Ni:
               Nee-womm!
 Arthur:       (to Bedevere) Those who hear them seldom live to tell the
               tale!
 Knight of Ni: The knights who say "Ni" demand...a sacrifice!
 Arthur:       Knights of Ni, we are but simple travelers who seek the
               enchanter who lives beyond these woods.
 Knights of Ni:
               Ni!  Ni!  Ni!  Ni!  Ni!  Ni!  Ni!  Ni!  Ni!
 Bedevere:     No! Noooo!  Aaaugh!  No!
 Knight of Ni: We shall say "Ni" to you...if you do not appease us.
 Arthur:       Well what is it you want?
 Knight of Ni: We want...

 (dramatic pause)
                              A SHRUBBERY!!!!
 (minor music)

 Arthur:       A WHAT?
 Knights of Ni:
               Ni!  Ni!!  Ni!  Ni!
 Arthur:       No!  No!  Please, please, no more!  We will find you a
               shrubbery.
 Knight of Ni: You must return here with a shrubbery... or else you
               will never pass through this wood...   alive.
 Arthur:       O Knights of Ni, you are just and fair, and we will return
               with a shrubbery.
 Knight of Ni: One that looks nice.
 Arthur:       Of course!
 Knight of Ni: And not too expensive.
 Arthur:       Yes!
 Knight of Ni: Noowwwww.... GO!

 (music, after which Arthur returns with a shrubbery)

 Arthur:       O Knights of Ni.  We have brought you your shrubbery.  May
               we go now?
 Knight of Ni: Yes, it is a good shrubbery.  I like the laurels
               particularly.  But there is one small problem....
 Arthur:       What is that?
 Knight of Ni: We are now no longer the Knights Who Say "Ni"!
 Other Knights of Ni:
               Ni!  Shh! Shh!
 Knight of Ni: We are now the Knights who say "Ekky-ekky-ekky-ekky-
               z'Bang, zoom-Boing, z'nourrrwringmm".
 Other Knight of Ni:
               Ni!
 Knight of Ni: Therefore, we must give you a test.
 Arthur:       What is this test, o Knights of.....
               Knights who 'til recently said "Ni"?
 Knight of Ni: Firstly, you must find....

                       ANOTHER SHRUBBERY!!!
 (minor music)

 Arthur:       Oh, not another shrubbery!!
 Knight of Ni: (excitedly) THEN... Then, when you have found the
               shrubbery, you must place it here, beside this
               shrubbery, only slightly higher, so we get a two
               level effect with a little path running down the
               middle.
 Other Knights of Ni:
               A path!  A path!  Shh, shhh.  Ni!  Ni!
 Knight of Ni: Then, when you have found the shrubbery, you must
               cut down the mightiest tree in the forest...
               Wiiiiiithh....  A HERRING!