New Delhi, Sept. 13 -- Flipkart's new advertisement ahead of their Big Billion Days sale is winning hearts on the internet, thanks to its unexpected collab. This time, instead of celebrities, sports personalities and influencers, the company featured India's most recognised mathematics genius and author, Dr R.D. Sharma. The video has left many nostalgic on the internet, reminding them of their school days.

The ad features Sharma taking a hilarious dig at students who, over the years, have often made fun of the questions in his popular textbooks. Creatively, all of them have been linked to the company's flagship event.

The ad opens with a classroom exam scene where a student remarks, "Thirty watermelons, 60 per cent off?" Another adds, "...