From "Monty Python and the Holy Grail"

ARTHUR: Nee!
BEDEMIR: Noo! Noo!
ARTHUR: No, no, no, no -- it's not that, it's 'nee'.
BEDEMIR: Noo!
ARTHUR: No, no -- 'nee'. You're not doing it properly.
BEDEMIR: Noo! Nee!
ARTHUR: That's it, that's it, you've got it.
ARTHUR and BEDEMIR: Nee! Nee!