When some one thinks about making a movie he must have an idea to implement that on camera and have some nice dialogues to pursue among people. Whether you are thinking for business or for public relations you must have a theme to place among people. Hindi films has a tendency to superficial the image of the hero  where as Hollywood films have tendency to urgency and run after big issues. Iranian films show man's kindness over natural situation, where as German films contemporary senses. Hongkong films are tending with kungfu but all films depicts their religion as well as mannars also, some believes only entertain might be the theme and some other such as Russians believe realism, but I love to think about realism and some sort of future steps should be included in movie themes.