What another would have done as well as you, do not do it. What another would have said as well as you, do not say it; what another would have written as well, do not write it. Be faithful to that which exists nowhere but in yourself-and thus make yourself indispensable.
As a writer, or as a filmmaker, you have to present yourself, and part of what yourself is is what you're interested in, or what you think is funny, or what you think is sad, or what you think is horrible.