What's a 'headless no-brainer'?

[Torsten]

You probably use the term 'no-brainer' from time to time. Earlier today Alan mentioned to me the expression 'a headless no-brainer'. Now I wonder if there is any idiom that tops a headless no-brainer.

TOEIC short conversations: Inviting participants for a customer research panel

[Yankee]

[Foah]

Yet I thought, the middle ages´ expression "slubberdegullian druggel" were the most rude insult I ever knew in English. :shock:
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"Ho ho!" said the clown

[Yankee]

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I'm still waiting with bated breath for Torsten to answer my questions. :wink:
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln