http://lesswrong.com/lw/k9/the_logical_fallacy_of_generalization_from
One day a peasant approached the Lord of the manor where he sat upon the lawn in the afternoon sunlight, reading an essay while drinking heavily.
"Lord! In an argument as to the superiority of a topic, I cited my favorite comic book, while my brother cited his favorite comic book. While they are both beautiful and elegant works of art, they say completely contradictory things! We have erred in some way, but we do not know how."
The Lord sighed, and set down the essay, careful to not allow it to touch his mead, as it was written by an imbecile and would surely sour the drink, should they touch.
"You have both comitted the sin of Generalizing from Fictional Evidence. In your argument, you cited works of fiction, which is not allowed, as fiction can say anything it pleases, being unbounded by the constraint of truth." He laughed. "Why, if you could cite fiction in an argument, I should always win debates at the Forum simpily by publishing a broadsheet that protrayed mine enemies as ignorant peasants, and myself as a wise and benevolent Lord, incapable of wrongness."
The peasant prostrated himself before the noble. "Wonderful, sublime! Truly, you are wise in all things!"
He nodded. "Yes. I am always right. People I disagree with are always wrong."
The end.