• Humor, to be comprehensible to anybody, must be built upon a foundation with which he is familiar. If he can't see the foundation the superstructure is to him merely a freak -- like the Flatiron building without any visible means of support -- something that ought to be arrested.

    Mark Twain, Gary Scharnhorst (2006). “Mark Twain: The Complete Interviews”, p.519, University of Alabama Press