The song 'Deewangi' was originally scheduled to feature the four mighty Khans of the industry, in what would have truly been an iconic moment in cinematic history. However, Farah failed to take into account Aamir Khan’s dedication to his pet project, 'Taare Zameen Par'. Apparently, on being approached for the cameo, Aamir bluntly informed Farah that if he gave 'Om Shanti Om' four minutes of his time, 'Taare Zameen Par' would suffer by four months. by Alisha Alam