Just recently, an old rejection notice has been uncovered that was once used by the Essanay Film Manufacturing Company, which produced silent films from 1907 until 1925, when it was absorbed by Warner Brothers. If you tried submitting a screenplay to them and it was rejected, there would be a check mark next to the main reason or reasons they did not want your script. Needless to say, many of these reasons certainly don’t apply to the studios these days, including the one the check mark is resting next to on this rejection notice: “Idea has been done before”. I particularly doubt that “not original” or “improbable” are taken into consideration either (and “not humourous” apparently, considering that Jason Friedberg-Aaron Seltzer films still get made).