The protagonist, like most people, has positive and negative thoughts; however, in his case, the negative thoughts take on a life of their own.

Kalidasa (Prakash Rai) works in the state archaeological department and is a food lover, he is 45 years old and remains unmarried. His only companion is his cook, Krishna (Thambi Ramaiah). Naveen (Tejus) is Kalidasa’s nephew who comes to stay with him while looking for a job. Kalidasa has a normal life until he gets a misdialed phone call from Gowri (Sneha), a dubbing artiste living with her friend Meghana (Samyukta Hornad). Gowri rings to order a Dosa from a restaurant, but gets Kalidasa instead. Their conversations do not go well at first, but a long-distance romance develops due to their common interest—cooking and food. Kalidasa is a born gourmet while Gowri is indulging in culinary activities in memory of her dead mother. Kalidasa starts to let Gowri into the secrets of baking with a multi-layered cake called “Joan’s Rainbow”.
Kalidasa and Gowri both get the jitters before their first face-to-face meeting, as each becomes conscious of their own physical appearances, and both decide to send younger and better looking substitutes instead, Naveen and Meghana. When they meet, neither Naveen nor Meghana realises that the other person is a substitute, since they introduce themselves as Kalidasa and Gowri respectively. Naveen thinks that Kalidasa is actually in love with Meghana while Meghana thinks that Gowri is in love with Naveen. They attempt to sabotage their older counterpart’s relationship by telling Kalidasa and Gowri respectively that the person they met would be unsuitable for them due to huge age difference and personality type. Kalidasa and Gowri try to forget each other and end up feeling sad for a long duration of the movie. Finally, Kalidas gives in to his loneliness and calls up Gowri and they both decide to meet face to face. Both of them decide to meet each other honestly to get it over with. Naveen and Meghana, who by this time had started to develop feelings for each other, are confused worried upon hearing this as they are afraid their true identity will be revealed to the other person. Naveen finally admits to Meghana that he is not the real Kalidasa and Meghana too explains her side of the story. They both realise the confusion and call Kalidasa to apologise and narrate all the incidents unknown to them. Kalidasa and Gowri finally meet each other at the planned museum and their relationship begins.

The film opens in heaven with Brahma and Naradar, in conversation with Lord Shiva about the importance of time and fate. Lord Shiva has a computer base of all the people in the world. He picks Tamizh (Arulnidhi) from his database and explains in detail the importance of time and even one minute can change the life of an individual. Lord Shiva shows three different episodes in a person’s life, just by change of time and how the delay changes the whole situation. He illustrates his point through a kidnapping incident. Tamizh is asked to kidnap his lover Isabella (Ashrita Shetty) by her father’s arch-rival in business as she is about to get married in a church. Tamizh is assisted by two other cons Malar (Bindhu Madhavi) and Isakki (Baghavathi).

Shashi Godbole is a homemaker who makes and sells laddoos as a home-run business. Her husband Satish and daughter Sapna take her for granted, mock her poor English skills, and generally treat her with disrespect, making Shashi feel negative and insecure. However, her young son, Sagar loves her as she is, and her mother-in-law offers her words of sympathy.
Shashi’s older sister Manu, who lives in New York, invites Shashi’s family to her daughter Meera’s wedding to Kevin. It is decided that Shashi will go to New York alone five weeks before the wedding to help Manu organize. Her husband and children will join her as the wedding approaches. During her flight to New York, Shashi is given inspirational advice by a fellow passenger (Amitabh Bachchan in Hindi/Ajith Kumar in Tamil). While Shashi is in New York, she has a traumatic experience at a cafe due to her inability to communicate in English. She is comforted by a French chef Laurent who happened to be queuing up behind her at the cafe.
Using the money she made from selling laddoos, Shashi secretly enrolls in a conversational English class that offers to teach the language in four weeks, showing her resourcefulness at navigating an unfamiliar city alone. The class comprises David Fischer, the instructor; Eva, a Mexican nanny; Salman Khan, a Pakistani cab driver; Yu Son, a Chinese hairstylist; Ramamurthy, a Tamil software engineer; Udumbke, a closeted African-Caribbean man; and Laurent. Shashi quickly becomes a promising and committed student, earns everyone’s respect with her charming behavior and her cuisine, and gains self-confidence. Laurent becomes attracted to Shashi. When he tries to kiss her at the rooftop of a building, Shashi rejects him and runs off, but fails to explain that she is married.

Nallasivam (Kamal Haasan) and Anbarasu (Madhavan) are drawn together by the strings of fate after they come into contact at the Bhuvaneshwar airport. Anbarasu is an advertisement director, while Nallasivam is a trade unionist. Fate entwines their travel plans, and they end up travelling to Chennai together. In the course of their journey, Anbarasu, born with a golden spoon, is touched by the realities of the sufferings of a normal human being when he witnesses the dead and the injured during a train accident, and he volunteers to donate his blood, which is of a very rare group, despite his fear of blood. The flashback of Nallasivam is recounted during one of their journeys. Nallasivam is a communist trade unionist, who fights for higher wages for his comrades. By chance, he falls in love with the daughter Bala (Kiran) of a rich industrialist, Bala’s father, Padaiyacchi (Nasser).

The descendants of two men who betrayed a royal family centuries ago are caught up in events that involve ghosts, revenge and kidnapping.

Taking advantage of the curfew enforced in two warring villages, a petty thief and call girl team up with an artist, who has a speech impediment, to steal gold hidden by a corrupt politician.

Mano (Bharath) loves Jo (Mallika Kapoor) and becomes her friend, hoping to help her win her love for Prem (Arun Vijay), whom she secretly loves. Then they both try to break Prem’s love with Nandhini (Deepu) and succeed. Mano realizes Jo’s deep love for Prem and tries to unite them. Mano succeeds in making Prem fall in love with Jo. Finally, Jo and Prem get married. During the story, the twists reveal that Mano had originally been in love with Jo but secretly tried to engage into her life by pretending to be in love with Nandhini. Soon after realising her true love for Prem, he sacrifices his love for her and brings Prem and Jo together. Only in the last several scenes does Jo realise Mano’s love for her, but she chooses to go with Prem.

Bhaskar (Arvind Swamy) is a business tycoon and single parent. His father Rangasamy (Nassar) is a retired businessman, and Bhaskar has taken over his businesses. Bhaskar deals with all the situations in his business with rowdyism and has a crude and crass personality. This behavior earns him the name ‘Rascal’. He is a widower and has a son Aakash (Master Raghavan). Aakash and Shivani (Baby Nainika) study in the same school. Shivani’s mother Anu (Amala Paul) is also a single parent. She meets Bhaskar at the school. Shivani admires Bhaskar for his authoritative stance and treats him like a father figure.

After following in her deceased father’s footsteps and becoming a police officer, a young woman experiences strange phenomena while attempting to capture a criminal that escaped from her father’s custody many years before.

Kannan (Vimal), Ayyavu (Bharani), Rajamani (Gaurav Narayanan), and Mariappan (Nishanth) are four friends who live their lives in their own way in Madurai. They are callous youths who go hammer and tongs to make both ends meet. Kannan, a wedding videographer, comes across his childhood friend Radha (Anjali), who is a compere in a local cable TV channel, and love blossoms. However, one event changes the course of their life. Kannan bashes a youth for taking obscene video clippings of a girl and blackmailing her with ulterior motive. The youth’s father (Kamala theatre owner Raju) finds out the men behind the attack on his son. He hatches a conspiracy and ensures that the friends themselves turn foes for each other. In the meantime, it is time for Kannan to tie the knot with Radha. Did the baddie succeed in his mission is the crux of the story.

Arivu, an unemployed youth, strives to find love and settle down but luck does not favour him. Just when he falls for Savithri, an ex-lover returns and creates problems between them.