Promos for movies have a variety of tasks to accomplish. A promo must generate interest in the movie; it must give the audience some inkling of the story while not giving the plot away; it must show some of the juicy bits, ensuring that the audience believes that there's more, and finally; it must set the expectations of the audience right, regarding the genre.
Now let us take a look at the promos of Ghanchakkar. They generated interest in the movie. Yes, the casting, the director, the music, Vidya Balan's costumes and her "hain" - everything did stoke interest in the movie - sc....