Mumbai, Nov. 29 -- Sara Ali Khan is famous on social media for several reasons-- her killer photoshoots, her creative shayari and her hilarious knock knock jokes which generally feature her brother Ibrahim Ali Khan. Well, recently the actress took to her official handle to hit two birds with one stone. She shared a hilarious knock-knock joke while promoting her song Chaka Chak, which releases today, from the much awaited film Atrangi Re. Bollywood heartthrob Vicky Kaushal, who will be sharing the screen with Sara in an upcoming untitled project, joined in on the fun. We can all agree that he stole the show by copying Sara's hook step! View this post on Instagram

A post shared by Sara Ali Khan (@saraalikhan95)

Well, Sara and Vicky are no...