Their wives arrive at the jail and the men emotionally reveal the truth. Afterwards, they are arrested and imprisoned. The very next day, the killer pursues the men, resulting in a shoot out in which they unintentionally kill the mysterious man. The guilt-ridden men go to their respective wives to apologise, since they feel like the truth is bound to be revealed. The next morning, a mysterious man finds them and reveals that he killed Monica, demanding a ransom to cover the crime. The trio goes to Monica's house for further investigation, and they hide in Monica's veranda after they realise that Sikander had followed them there. They panic and try to hide her body, in order to avoid blame, but are interrupted by police officer Sikander ( Ajay Devgn), who is suspicious of them. Having gathered the money, the terrified men arrive at the drop off location, only to find Monica dead in her car. She blackmails the trio, threatening to expose the affairs to their wives unless they give her Rs.

They set their sights on other women but eventually realize they have all been seeing the same girl, Monica ( Lara Dutta).

Fed up, the men get together one day and make plans to reintroduce the fun and excitement back into their lives. Amar marries Bindiya ( Genelia D'Souza) who is dominating and they live with her equally aggressive mother ( Archana Puran Singh). Prem marries Geeta ( Tara Sharma) who is overly religious and thus their sex life suffers. Meet marries Anchal ( Amrita Rao) who is obsessively possessive about her husband. Their lives are carefree until they each get married and turn into bitter, unsatisfied husbands. Masti revolves around three bachelors, Meet ( Vivek Oberoi), Prem ( Aftab Shivdasani) and Amar ( Ritesh Deshmukh).

Dil diya hai jan bhi denge