Non Sequitur by Wiley

Wikipedia defines it as "Non Sequitur is a comic strip created by Wiley Miller in 1991 and syndicated by Universal Press Syndicate to over 700 newspapers. The strip can be found online at uComics.com, although archives are only viewable with an account. Non Sequitur is often political and satirical, though other times, purely comedic." If you get the chance have a look at the January 12, 2006 edition. (It's in today's "Age" but not up on the official site as yet.) It is titled "The Glamour of Writing" and depicts a typical book signing in a book-store: the first has a sign saying "Meet the Author", the second "Meet an actor who plays a minor role in the film adaptation of the book!" No guesses where the line is.