The film world has always been known for a certain amount of navel-gazing, but until I took a proper look, I didn’t realize that quite so many movies have been made concerning the exploits of screenwriters, the oft-denigrated work horses of the industry.  As the first trailer for David Fincher’s Netflix biopic Mank (about Citizen Kane screenwriter Herman J. Mankiewicz) what better time to remind readers of some other adventures of screenwriters on screen?