It is rumored that Bollywood actor, Aamir Khan, compelled Rajkumar Hirani, director of PK, to cast him in the lead role. If the rumor is believed to be true then Aamir Khan was not the first choice for the religious satire.
Citing an anonymous source close to the crew of PK, Bollywood Life said that the director at first considered Ranbir Kapoor to play the lead and approached him for the same.
When Aamir Khan came to know about it, he took the advantage of his good relationship with producer Vidhu Vinod Chopra and together compelled Hirani to cast him instead of Ranbir Kapoor. After some look tests, director got convinced and decided to cast him. As he approached Ranbir Kapoor for the role, he offered him a short role in the film.