Ibrahim Ali Khan is fed up with Sara's 'knock-knock' jokes: Watch brother-sister duo video

Bollywood diva Sara Ali Khan is known for her 'knock-knock' jokes. This time, she made a whole birthday special, lined up jokes for brother Ibrahim and shared it with her fans. In the video, the brother and sister duo is seen in a colour-coordinated neon dress. The video is captioned as "Knock Knock". Sara started the video with, "Ok Ibrahim, Knock Knock", Ibrahim said, "Who's there?" Sara said, "Abby", brother said, "Abby who?" Then the actress started singing "Abby birthday to you." Watch the adorable yet hilarious video.