In 2009, three friends Rancho (Aamir Khan), Farhan Qureshi (R. Madhavan) and Raju Rastogi (Sharman Joshi) came into our lives and changed it for good. 

Thanks to them, we realised the true meaning of friendship; and figured out that following our dreams and passion may be tough indeed, but it's definitely a path worth treading on, because what waits at the end is success. 

© Vidhu Vinod Chopra film

'3 Idiots' is one of the best movies ever and while we all loved the trio's unique friendship, there was one more character who was equally loved for the most part of the movie. Although he was a supporting character, we thoroughly loved his hilarious antics and his passion for learning.

© Vidhu Vinod Chopra film

We're talking about Millimetre (Rahul Kumar), a young errand boy in the Engineering college who used to run chores for students like laundry, getting groceries and even finishing their assignments. 

© Vidhu Vinod Chopra film

If you're a '3 Idiots' fan like me, then this dialogue has to be fresh in your memory to this day, "Millimetre ab Centimetre ban chuka hai". The same dialogue that Phunsuk Wangdu's assistant says in front of Rancho's friends, when they meet him after 10 years. 

9 years on, the real Millimetre is all grown up, but he looks nothing like the Centimetre we saw in the movie. Looks like we've been living a lie all these years. 

And the RANCHO and MILLIMETER reunites... !! Time to partyâð

A post shared by Rahul Kumar (@isthis_rahul) on Oct 12, 2017 at 1:32pm PDT

The kid has now turned into a handsome 22-year-old, who has several movies and television serials in his credit. 

And you think you own it? Naah you don't !! âð»â¤ï¸

A post shared by Rahul Kumar (@isthis_rahul) on Jul 3, 2018 at 11:40am PDT

Rahul was all of 3, when he started acting in theater. Apart from '3 Idiots', he's been a part of movies like 'Omkara', 'The Blue Umbrella' and 'Zoo'. 

Jungle jungle âð¼â¤ï¸ð !!

A post shared by Rahul Kumar (@isthis_rahul) on Aug 8, 2018 at 12:24pm PDT

Rahul has also acted in a lot of TV serials in supporting characters and his performance was appreciated by all. 

Zoo housefull first day at MAMI. Thankyou guys for those sweet comments and appreciationâð

A post shared by Rahul Kumar (@isthis_rahul) on Oct 15, 2017 at 11:59am PDT

While Rahul may have moved on from his '3 Idiots' character, for us, he'll always be Millimetre.