Amirchand is the ill-fated father of two mischievous sons—Sonu and Monu. Both of them are always up to one prank or another, most of them aimed at stealing money from Amirchand. In the opening scene, they call up their father, acting like gangsters, and ask for a huge sum if he wants to live. The plan fails as Amirchand turns out to be the driver of the taxi in which they were escaping. Later, they fix up the marriage of their father with Shakuntala and take one lakh rupees as advance dowry from her brother Jamnadas. This plan also fails as Amirchand refuses to entertain Jamnadas and his sister. Amirchand warns their sons to become serious towards life if they want to live in his home. He asks Monu to join office and Sonu to go to Goa for claiming some money he had lent to someone. Whereas Monu plays another prank by calling up a girls' hostel and flirting with Ritu, Sonu mistakenly goes to one Gulzarilal Verma for claiming the money, where he meets Pooja. Both Ritu and Pooja are Gulzarilal's daughters. Sonu and Monu fall in love with Pooja and Ritu, respectively. Sonu calls up Monu to come to Goa, disguised as his Uncle for fixing up his and Pooja's marriage. This leads to a series of confusions as Gulzarilal's sister Santho also falls in love with Monu. To get rid of the problem, Sonu and Monu throw a dummy of the Uncle from top of a cliff, only to land up getting arrested for killing the non-existent uncle. Amirchand comes to know of this and reaches Goa with his assistant Kunj Biharilal. In favour of the story's and Sonu and Mon's fate, Amirchand and Gulzarilal turn out to be long lost friends. Together they set out towards the nearest police station when they get kidnapped by a Bhai. Sonu and Monu escape from the lockup with Bhootnath's help and rescue their father and to-be father-in-law, thus proving to be worthy sons.
In the beginning of the film, Sonu and Monu are in a restaurant and don't have money to pay the bill. Monu picks the pocket of Shakti Kapoor for his wallet and then tries to keep it back but his hand gets stuck. This scene is taken from The Return of Mr. Bean, an episode from the Mr. Bean television series. This scene is repeated in the movie Dhamaal.
