12 -- 13 -- 14

A visiting scholar, lecturing on 'How Many Philosophical Positions Are There In Principle?' began, "In principle, there are precisely twelve philosophical positions ..." "Thirteen!" called out a voice from the audience. "There are," repeated the lecturer, "Exactly twelve positions; no more, no less!" "Thirteen!" called out the voice. "I shall proceed," said the irked lecturer. "The first position is sometimes called 'naive realism,' in that it is the view by which, more or less, all things are very much the way they seem to be ..." "Oh!" interrupted the voice from the audience, "Fourteen!"

--a philosophy joke from Jerry Fodor in an issue of The London Review: