Bollywood trailer of movie `Piku` has been released by none other than the lead actor Amitabh Bachchan himself. Fans had desperately waited for the trailer, which will release with Sushant Singh Rajput`s movie `Detective Byomkesh Bakshy!`. Big B gave a sneak peek of it. `Piku` features Deepika Padukone, Amitabh Bachchan and Irrfan Khan. Interestingly, the start of the trailer shows Deepika and Big B arguing about a trailer and Irrfan Khan mediates by saying ``Loh, shuru ho gaye dono`` (again they have started).