From: "Spiny Norman" 

I have two options...

1. It's part of the call of the knights who say Ni. As you might recall,
they later turned out to be 'no longer the knights who say ni', but the
knights who say ecki ecki ecki ecki PTANG zoo poing. That would mean it's
from The Holy Grail.

2. In the Flying Circus, Graham Chapman plays a vicar who does an appeal
for sanity. Read the full text at
http://orangecow.org/pythonet/sketches/sillyvic.htm

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