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'PK' is the toughest role of my career: Aamir Khan

PHOTOS:

Hirani took five years to complete the film. "When I was finishing '3 Idiots' I realised that I should start my next film and at that point of time I and Abhijat (Joshi) went for a walk at Borivli National Park. And there we thought of PK and then Abhijat went to USA.