Actors who rejected films and later on felt guilty

Akshay Kumar: It is impossible to believe that anyone apart from Farhan Akhtar would play the role of Milkha Singh from 'Bhaag Milkha Bhaag'. The first choice of makers was the stunt master Akshay Kumar which he did not do and ultimately, Farhan Akhtar did the role perfectly well and received National award for best actor.