Megastar Amitabh Bachchan, who has been very active on Twitter, marked his 786th day on the social networking site. He reveals the mystery behind the number 786, since it's been a lucky number to him. Recalling his Coolie and Deewar days, the Big B tweeted, "T 786 - In Deewar the 786 Billa in his coat pocket saved him when he was shot at .. when it dropped out in the climax, he was shot and died."