'Student of the Year' star Sidharth Malhotra took role of a teacher to impart a lesson to popular Indo-Canadian online personality Lilly Singh, also known by her YouTube username IISuperwomanII.

When the YouTube star "questioned her brain" for not following Sidharth on Twitter, the actor said it's never too late to do a good thing.

She tweeted "That moment when you realize you weren't following Sidharth Malhotra and question your brain functionality", and Sidharth responded "IISuperwomanII Never too late for good deeds! Congrats on unicorn".

To which, Lilly shared: "Thanks friend! Next time I'm in India...food together".