One day, two philosophers were dining in a restaurant. "There's no such thing as lying," said the first philosopher to his companion. "Anytime someone speaks falsehood, it must be the case that they are merely deluded, or that part of them is, for the love of truth is so essential to the nature of agency that the very notion of deception is repugnant to it."

"On the contrary, there's no such thing as delusion," said the second philosopher. "Anytime someone thinks falsehood, it must be the case that they are merely lying, or that part of them is, for the perception of truth is so essential to the nature of agency that the very notion of misapprehension is repugnant to it."

A waitress, overhearing this exchange, found that she did not want to restrain herself. "You're both lying!" she shouted at the philosophers. "Stop lying!"