I stopped at a fast food restaurant, intrigued by a sign which offered fat free fries. I decided to give them a try, but I was dismayed when the clerk pulled a batch of fries from the fryer dripping with fat, and then put a bag of these fries in with my order.

"Just a minute," I said, "those aren't fat free."

"Yes, they are," he replied. "We only charge for the potatoes, the fat is free."

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