"Pankaj Kapoor as an actor is a very challenging co-star to act opposite, because he improvises a lot and he pulls out new things as they happen. You have to be in the moment with him, you have to be ready with whatever he will do, and you have to be ready to pick that up and take it forward," Imran said.

Imran Khan with Anushka Sharma and Pankaj Kapoor in 'Matru Ki Bijlee Ka Mandola'. Pic/Santa Banta