Released in 1998, the romantic-drama starring Shah Rukh Khan was one of the blockbusters of the year.
"Kuch Kuch Hota Hai" chronicled the story of a mother, played by Rani Mukerji, who leaves eight letters for her daughter before her death, so that she can unite her father (Shah Rukh) with his best friend, enacted by Kajol, as she believed he loved her.
"Actually, 'Kuch Kuch Hota Hai' is a very unusually silly theme. Don't know what the mother wrote in those eight letters, how can a eight-year-old read that?
"He (the hero) says, 'Zindagi may pyaar ek bar hota hai, shaadi ek bar hoti hai', but he himself has fallen in love twice, got married twice. Everything was wrong, but it was written with so much conviction that it made sense," the 44-year-old director said.
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Johar said he was 24 when he wrote the film and was inspired by the cinema of Raj Kapoor, Yash Chopra among others.
The "My Name is Khan" helmer said he often gets stumped
when people ask him questions regarding the characters in the film, ranging from Shah Rukh's profession to just how easily his character fell in love with Kajol's post interval.
"Somebody asked me what was the profession of Shah Rukh in the film and I had no idea! I said he had a business. The man asked, what kind of business he had that he had so much time to go to a summer camp for one month?"
Johar said same is the case with his multi-starrer "Kabhi Khushi Kabhie Gham" which featured megastar Amitabh Bachchan, Jaya Bachchan, Shah Rukh, Kajol, Hrithik Roshan and Kareena Kapoor.
The director said he thought he was making a "Ramayan of family films", but the film followed a similar pattern of "Kuch Kuch Hota Hai".
"It is the same screenplay, which I realised much later. That time I thought I was making epic, Ramayan of family films but is the same story of 'Kuch Kuch Hota Hai'," he added.