Shah Rukh Khan's comeback film 'Pathaan', which also stars John Abraham and Deepika Padukone, remains unbeatable at the box office. The film has already made a whopping Rs 542 crore gross worldwide in just five days since its release on January 25. Now after its success, renowned filmmaker Anurag Kashyap has showered heaps of praises on SRK and called him an actor with ‘the strongest spine’.