One of the most successful filmmakers of Bollywood, Karan Johar is all set to celebrate his 40th Birthday. Celebrities from Bollywood fraternity are equally excited to attend the film maker's grand birthday bash. While recalling his most embarrassing moment in the childhood days, Karan spoke about a very awkward situation which he cannot forget till date. For more on Karan's most embarrassing birthday party story, here is a look at the video.