Irrfan plays the role of Rana Chaudhary, who runs a cab service in Delhi and that's how he comes in Piku and her father's life.
The actor said the movie, slated to hit the screens on May 8, was an emotional but fun ride for him, Deepika and Amitabh Bachchan.
"It is a very entertaining and engaging film and love is a very important part of this story. It was Shoojit's trust in me that he gave me a romantic lead. I was longing to do something like this. I also wanted to do comedy. Coincidently, I got both these elements in 'Piku'," Irrfan told PTI in an interview.
"We were shooting on the Gujarat highway and we were in the car. The director and actor can talk very little because there is an urgency in such scenes. In this scene, which is very small, I have to give her a look and say something because we have been travelling for a long time. It is just a look but so beautiful. Shoojit was emotional after seeing it."
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He loved the way Shoojit extracted a restrained performance from his actors.
It is for the first time that Irrfan is working with Big B and the actor loved every moment of their scenes together.
"Bachchan saab is Bachchan saab. I have been offered roles with him earlier but nothing materialised so when you get a chance to work with him, you want to make it as memorable as possible. It was exciting to be with all the actors be it Deepika or Moushumi Chatterjee. It was very engaging."
"It is new Bollywood. Audience is waiting for Bollywood to redefine itself. We should incorporate the intelligence of audience. I feel directors like Shoojit and writers like Juhi (Chaturvedi) will take it in a different direction.