by Bill Griffith Zippy the Pinhead is a pop culture icon. The surrealist-leaning character is one of the most recognizable figures on the newspaper pages, seen by tens of millions of people a day. Syndicated by King Features since 1986, Zippy is read in hundreds of daily newspapers across the country, while the Pinhead's trademark non-sequitur, "Are we having fun yet?," has become so often repeated it's in Bartlett's Familiar Quotations . His likeness...