"Knock-Knock": Sara Ali Khan Is Back With Her Jokes, Ibrahim Ali Khan Is Still Not A Fan "Knock-Knock": Sara Ali Khan Is Back With Her Jokes, Ibrahim Ali Khan Is Still Not A Fan Ibrahim Ali Khan's expressions say it all Sara and Ibrahim in a still from the video. (courtesy saraalikhan95) Highlights Ibrahim celebrated his 20th birthday on Friday Sara and Ibrahim frequently feature on each other's profiles New Delhi: There is absolutely no escaping Sara Ali Khan's knock-knock jokes, not for her brother Ibrahim Ali Khan at least. For the uninitiated, the actress maintains a series of knock-knock jokes on her Instagram profile, in which she shares jokes. In the goofy video, Sara can be seen cracking these jokes and well, Ibrahim Ali Khan's expressions say it all. Sara begins the video with her signature "knock-knock." To which Ibrahim replied, "Who's that." Sara jokingly adds, "Abby." When a clueless Ibrahim asked her "Abby who" then Sara sang, "Abby birthday to you." What followed was a series of more knock-knock jokes. "Knock Knock," Sara Ali Khan captioned the post.