Actor-filmmaker Tinnu Anand recently opened up about the time when megastar Amitabh Bachchan was diagnosed with myasthenia gravis, a rare autoimmune disease that causes muscular weakness, leaving the actor nearly fighting for his life. This revelation came shortly after Bachchan’s critical injury on the sets of Coolie in 1982, where a fight scene with co-star Puneet Issar led to a severe intestinal injury, further complicating his health.