About :
Farhan Qureshi (R. Madhavan), Raju Rastogi (Sharman Joshi), and Rancho or Rancchoddas Shyamaldas Chanchad (Aamir Khan) are three engineering students who all share the same room in a hostel at the fictional Imperial College of Engineering, one of the best colleges in India (modelled after IIT). While Farhan and Raju are mediocre students from modest backgrounds, Rancho is a wealthy genius who studies for the sheer joy of it. Yet it is precisely his passion for knowledge and his gift for creating machines that incurs the wrath of Professor Viru Sahastrabudhhe (ViruS) (Boman Irani). Threatened by Rancho's talent, ViruS labels him an "idiot" and attempts on a number of occasions to destroy his friendship with Farhan and Raju. In contrast, ViruS’ model student is Chatur Ramalingam or "Silencer," (Omi Vaidya) a geek who lives by conforming to the expectations of the system, mindless cramming, and unethical means of destroying his competition. Meanwhile, Rancho also falls in love with ViruS' pre-med daughter Pia (Kareena Kapoor).

Their story is framed as a flashback from the present day, ten years after graduation. Having lost contact with Rancho who disappeared during the graduation party, Raju and Farhan begin a journey to find him. They are joined by Chatur, now a wealthy and successful businessman, who joins them to settle a bet with Rancho and meet a business associate named Phunsuk Wangdu. Raju and Farhan also find and bring Pia along with them.