The Knights Who Say NI...

Here cometh bold Sir Robin,
Nothing scareth he...
But then, he's never come up
Against the dreaded Knights of NI!

The Knights that say "NI!" were terrible foes,
Their voices scorched your eardrums;
Then their red-hot blades went SNICKER-SNACK
As they swiftly sliced off your bums!

Only Brave Sir Robin was left
To stand against these fiends;
He heard the "NI!" and pooped himself
And hid in some tall weeds...

But LO! here comes Sir Lancelot,
That homicidal hero;
With sword in hand he hacks away
Until their numbers are zero...

And thus the glorious day was saved,
No thanks to brave Sir Robin...
If you find a word that rhymes with his name
I'll give you a shiny gold dobbin!