What's the story behind Mushtaq Khan's iconic 'meri ek taang nakli hai' dialogue in 'Welcome'?

'Welcome' movie director Anees Bazmee has revealed the story behind the iconic 'meri ek taang nakli hai' dialogue by Mushtaq Khan, who passed away at the age of 56. He recalled Mushtaq's role was to just stand behind the bodyguard, and he had no lines several days into the shoot. Then one night Bazmee wrote Mushtaq's dialogues, which became iconic.