Makers of Aamir Khan and Anushka starrer 'PK' have been keeping the story under wraps. But the shocking secret of PK has recently been unveiled. For all who want to know what PK is, it is all there in the dialogue promo of PK where we see Aamir Khan introducing himself as PK to Anushka Sharma and how hilariously the name gets misinterpreted. Aamir Khan is supposedly an alien in the film and surprises everyone with his acting and looks.