A lot of writers believe that originality in stories are dead. Every story has been done in some way before. The ability to write a truly original story that is not just some sort of insane nonsense is impossible, or at least extremely difficult. Movies are not immune to this either. Many box office busting films often get accusations from movie buffs of being rip-offs of other, older movies. You do not have to be a critic or a movie buff to notice it either. Many movies draw ideas from other films, some directors own up to it but others fervently deny it.