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"I've been very obsessive about writing science fiction for far too many years. Anyone with an ounce of sense would have given up years ago."
- Charles Stross

Pizzled (Semantic Garble)  
  Use of nonsensical statements to deliberately confuse an artificial intelligence.  

This is the earliest use of this idea that I can find.

The instruction sheets listed rows of possible defects, with neat boxes by each; a punch-stick was included to indicate the particular deficiency of the product.

"What'll I check?" Morrison asked. "Contaminated? Bacterial? Sour? Rancid? Incorrectly labeled? Broken? Crushed? Cracked? Bent? Soiled?"

Thinking rapidly, O'Neill said, "Don't check any of them. The factory's undoubtedly ready to test and resample. It'll make its own analysis and then ignore us." His face glowed as frantic inspiration came. "Write in that blank at the bottom. It's an open space for further data."

"Write what?"

O'Neill said, "Write: the product is thoroughly pizzled."

"What's that?" Ferine demanded, baffled.

"Write it! It's a semantic garble -- the factory won't be able to understand it. Maybe we can jam the works."

From Autofac, by Philip K. Dick.
Published by Galaxy in 1955
Additional resources -

Further dialog was required:

"Analysis of the rejected product," it stated, "shows no foreign elements or noticeable deterioration. The product meets the continual testing-standards employed throughout the network. Rejection is therefore on a basis outside the test area; standards not available to the network are being employed."

"That's right," O'Neill agreed. Weighing his words with care, he continued, "We found the milk substandard. We want nothing to do with it. We insist on more careful output."

The machine responded presently. "The semantic content of the term 'pizzled' is unfamiliar to the network. It does not exist in the taped vocabulary. Can you present a factual analysis of the milk in terms of specific elements present or absent?"

"No," O'Neill said warily; the game he was playing was intricate and dangerous. " 'Fizzled' is an overall term. It can't be reduced to chemical constituents."

"What does 'pizzled' signify?" the machine asked. "Can you define it in terms of alternate semantic symbols?"

O'Neill hesitated. The representative had to be steered from its special inquiry to more general regions, to the ultimate problem of closing down the network. If he could pry it open at any point, get the theoretical discussion started. . .

" 'Pizzled,' " he stated, "means the condition of a product that is manufactured when no need exists. It indicates the rejection of objects on the grounds that they are no longer wanted."

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Additional resources:
  More Ideas and Technology from Autofac
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to Autofac
  Tech news articles related to works by Philip K. Dick

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