New Delhi -- Filmmaker Sujoy Ghoshs latest flick Kahaani, which has impressed both critics and audiences by its gripping story, has found one more admirer in none other than megastar Amitabh Bachchan who calls it a brilliant film. The 69-year-old who had worked with filmmaker Sujoy Ghosh in multi-starrer Aladin has congratulated Ghose on his Twitter account after watching the film. "So ... finally watched "Kahaani", the new release made by my dear mad friend Sujoy Ghosh, who made "Aladin" with me. And my message to him after all the congratulatory tones was 'what the heck were you doing all this while making films like Aladin???'," Bachchan posted. Mr Bachchan, who has sung Rabindranath Tagore's Ekla Chalo Re in the film, said he was not sure about his voiceover in the movie. "Such a wonderfully gripping story shot superbly and enacted by all the cast so deliciously. I feel a sense of great joy to be in some minuscule manner a part of this film in commentary and song. I am often wary of voice overs to film. Most of the time they fail! But I am certain this one will keep the box office flag flying... well done Sujoy, and keep up the good work... !!."