Swamy and Anand who look exactly the same, come from different backgrounds. Under dicey circumstances Pranavi, a young and pretty girl falls in love with both of them. How will Swamy and Anand solve their problems?

A wealthy man delegates a trusted subordinate to hide priceless diamonds in a set of chairs before he is murdered by a trio of criminals out to get their hands on the same. Twenty years later, the hunt for the chair resurfaces as the trusted subordinate reveals partial information about the treasure to the protagonist, Krish. Realizing that he needs a little help, Krish enlists the help of his thieving rival, Veni. The villainous trio, also privy to this information, follow Krish and Veni as they set out to find the diamonds. A hilarious cat and mouse chase ensues as the main characters follow clues, traveling from city to city, assuming different personalities to find the chair with the diamonds, while being chased by the quirky, nosy police inspector Mathrubhootham. With Crazy Mohan’s typical brand of pun-filled humor, director Madhumita guarantees a fast-paced, laugh-a-minute ride with KKM.

The story starts with Vasu (Vaibhav) narrating his story from childhood. He has four close friends: Kanagasabhapathi (Karunakaran), Kalyanasundaram (Arjunan), Pattabi (Venkat Sundar), and Venky (Karthik Priyadarshan). The five friends worship Seenu Anna (Robo Shankar) for his dedication to friendship, and one day, he advises to them that marriage will spoil friendship.
All the friends take this seriously, except for Vasu, who has a liking for girls. After failing many attempts of falling in love at school and college (his friends spread rumors that Vasu is gay), he decides to leave to Chennai so that he would get an opportunity to love a girl. He stays with Nelson (VTV Ganesh), who has affairs with many rich and beautiful girls. Nelson persuades Vasu to trap a rich girl, citing that middle-class and college girls will have bigger competition and high expectations, but rich girls have very less expectations, and many guys do not try to date them, assuming that it is impossible to woo them. He hands the pub membership card to Vasu so that he can get to see many rich girls.

Tamil, a young IT professional, is raised single-handedly by his grandfather but later moves to the city. His relationship with his grandfather deteriorates after the latter causes him embarrassment.

Shakti (Madhavan) is a young man from a village with no job but much ambition and dreams. As he sees his life pass him by, stuck in a rut in his hometown, he decides that he will try his fortunes elsewhere. Chennai beckons him and off goes Shakti to join his uncle Kirikalam (Vadivelu), who has a stall of magic tricks at an exhibition. Kirikalam is not really a magician, but is posing as one, and his amateurish tricks don’t exactly bring in big crowds.
Next door to Shakti and Kirikalam’s stall though, is one ever-populated with visitors. The reason: it’s an all-girls stand, with mermaid costumes as the theme. Velli (Reema Sen) is the ‘head mermaid’ at this stall run by her sister, and bitter quarrels between her and Shakti ensue, when he feels that she and her team are unfairly taking their customers away, and she has this impression of him being an unsavory character. This misunderstanding is seen at different occasions where Velli and Shakti just happen to be in the wrong place at the wrong time — be it when Shakti gets off the bus from his village, asks for directions and is told to follow Velli, walking in the distance (Velli thinks he’s a womaniser) or when Shakti finally catches up with a miscreant who had picked his pocket and demands his money back — only Velli walks into the scene only at the demanding part. This whole collage of scenes is animated, with Kirikalam and Shakti trying to woo customers back to their stall, Shakti and Velli getting into arguments, and a general state of “fun” ruckus. Of course, love has been brewing as an undercurrent between the two young people.

The story of a fun-loving boy Bablu and his humorous love tale with a don Shankar Dada’s sister Deepika.

Vasu (Jiiva) is a house broker who sells houses by using tricks with his friend Sooranam (Soori). He has a pet dog named Scooby. Vasu and his mother Parvathy (Raadhika) are living in her brother’s (Ilavarasu) house for rent. Vasu and his parents had lived in houses for rent throughout their lives. After Vasu’s father’s (Uday Mahesh) death, he took a vow of buying a bungalow on the outskirts. After some years, Vasu buys the bungalow and enters the house with his whole family. He later finds that there was a family that had lived there earlier. Jambulingam (Thambi Ramaiah) lived there with his wife (Devadarshini), mother, and daughters. He refused to move out of the house, so Vasu decides to live there until he finds the owner who cheated him. Vasu and Jambulingam’s daughter Shwetha (Sri Divya) fall in love with each other. Vasu and Sooranam try some ghost tricks to chase Jambulingam’s family out of the house

The marriage of Meera, a college student, and her boyfriend Saravanan has been approved by the family. But the condition is as after a job after graduation. But when Meera becomes pregnant, the whole story gets upside down

The movie revolves around three old men. Ashok Lalwani alias Lali, (Anupam Kher) is not happy with his wife (Rati Agnihotri), who is a staunch believer of God and doesn’t spend time with him. Kamaldheer Sharma alias KD (Annu Kapoor) is a bachelor for some unknown reason, while Pinky (Piyush Mishra) is secretly in love with a young Chinese woman, who only knows English but he himself being uneducated, is unable to express his feelings. The three men plan a holiday to Mauritius to have some fun, where they meet Ahana (Lisa Haydon), who is a social networking addict and gets annoyed because her rival girls have more Facebook likes and her ex-boyfriend had been commenting and liking their posts and condemning her at the same time.

Vishnu (Nakul) is on his way from Coimbatore for his new job and also to see his Fiance who is his uncle’s daughter. During his journey he meets Pavitra (Nikesha Patel) and upon his arrival in Chennai, problems begin. Simultaneously Narathan (Premji) a renowned movie director is at his uncle’s place who is also a movie producer. Narathan narrates his story to Vishnu’s uncle and interestingly all the incidents have been happening in Vishnu’s and all the other people’s lives.

Gautham (Bharath), a college dropout and good-for-nothing guy, falls in love with Narmada (Genelia D’Souza), the daughter of a local don Sakthivel (Radha Ravi). She lives in a hostel after learning that her father is a criminal who now wants her to marry his partner Sardar’s (Brahmaji) brother. So the two lovers elope to Mumbai, and they are soon tracked and separated. Finally, Gautham, along with his friends, fights against all odds to win back Narmada.

In a moment of panic, when Balu ends up insulting Lord Ganesha, the Hindu elephant God, his mount becomes enraged and sends a mouse to create havoc in his life. How can Balu escape from the mouse’s vengeance?