Naannnnnnnn Sirithaalllllllllll

The film opens with an interview given by Thyagu, Gopi and Gandhi. Gandhi then starts to tell the story of his life. He is a happy-go-lucky man who works in the IT sector. He is in love with his office colleague Ankitha. Due to unfortunate circumstances at his workplace, he is told to clear his failed exams in Engineering, or else he would lose his job. Ankitha also pressurizes him to study well and pass the exam, yet he is unable to study properly and enters the exam hall. Seeing the question paper, and getting insulted by his friend and an examiner, which contains out of syllabus questions, all the stress from various parts of his life gets accumulated and Gandhi starts to laugh uncontrollably in the exam hall. This is when his laughing problem begins. This condition is called 'Pseudobulbar affect', for which he faces trouble in various places and even Ankitha breaks up with him, so he consults a psychiatrist, Veerabadhran. He is not allowed to tell about this to anyone as he has tied a sacred talisman which will help him solve his problems. Meanwhile, Gandhi's close friend Dilli Babu is heartbroken because his girlfriend, Priya is marrying someone else and tells them that he plans to commit suicide. So Gandhi and his friends go in search of him. Meanwhile, there is also a dreaded gangster in the town, also named Dilli Babu who has Minister Thangadurai's secret hard drive for safekeeping. Sakaradas is Dilli Babu's arch-nemesis. Hence, he sends his henchmen Nelson and Manikkam to kill Dilli Babu at his birthday party and steal the hard drive. Gandhi and his friends book Ola Cabs to file a missing-person complaint against their friend Dilli Babu; Nelson and Manikkam also arrange for a car to go to the gangster Dilli Babu's birthday party. In a sheer twist of coincidence, both the cars are at the same pick-up location, in the same colour with the same OTP code. Gandhi and his friends get in the wrong car to Dilli Babu's birthday party. Nelson and Manikkam end up at