<span class=normal>Amitabh Bachchan, during his journey in Bollywood that spans over four decades, has had many iconic films to his credit. The megastar, who has a massive fan following, loves to be on the social networking sites and the actor recently reminisced about his old days while shooting for some of his biggest blockbusters and took to Twitter to talk about it.<BR><BR><br><p class=clear>&nbsp;</p>One of the milestones in his career was the film Don where he played a double role of a ruthless smuggler and an emotional street performer. Posting the picture from the sets of the film, Amitabh said, DON film, Chandra Barot director, briefing me .. days of bell bottomed trousers !! They shall come back ! </span>