A movie consisting entirely of questions. The only words that appear in it are in the form of questions.
Would you be interested in seeing it?
Is such a movie likely to have good word-of-mouth marketing potential?
Would making such a movie present an interesting challenge to a screenwriter/director?
There is only one rule the screenwriter has to follow: no words can appear or be spoken in the movie unless they are in the form of a question.
Can it be pulled off so that the viewers hardly notice it?
That's it. Now do your magic:)