For more than a century, the Hindi film industry, also known as Bollywood, has played a crucial role in shaping Indian culture. It has made a wide variety of films in different genres, including action-packed thrillers, love musicals, and intense dramas. But in the early 2000s, adult comedy, a new genre, started to appear that would drastically alter the Indian film industry. One of the pioneers of this genre, "Masti" brought about a profound change in the way that humour and narrative were handled in the Indian film industry. This article explores the introduction of adult comedy in Hindi film and the revolutionary function of "Masti." Adult humour was not a major feature of mainstream Bollywood prior to the 2004 release of "Masti". Family-friendly melodramatic stories with sporadic bursts of slapstick humour were the industry's main focus. It was difficult for filmmakers to venture into the unexplored genre of adult comedy because of the strict taboo around sexual themes and innuendos. Filmmakers, however, saw a chance to produce material that appealed to a wider audience as Indian society started to change and take on a more liberal viewpoint. Indian filmmakers ventured into this unexplored territory after the success of Hollywood comedies featuring adult themes, like the American Pie series. Indra Kumar directed the 2004 film "Masti," which starred Riteish Deshmukh, Aftab Shivdasani, and Vivek Oberoi in the key parts. The movie chronicled the lives of Meet, Prem, and Amar, three friends who are fed up with their dull married lives. They leave their marriages in search of adventure and love, which sparks a string of hilarious mishaps and misunderstandings. They do this in search of excitement. Tackles Taboo Subjects: "Masti" bravely tackled topics that were previously taboo in Hindi cinema, such as extramarital affairs, infidelity, and sexual frustration. By using humour and satire to present these issues, the movie made it easier for the audience to understand these kinds of themes. Explicit Humour: Double entendres, innuendos, and suggestive scenes were frequently used in "Masti" humour, which was humorous. That marked a change from the traditional slapstick humour that had been popular in Bollywood up until that point. Ensemble Cast: Lara Dutta, Amrita Rao, and Genelia D'Souza were among the film's talented ensemble cast members, and they all made a significant contribution to the movie's success. Their relationship with the male leads improved the comedic elements and gave the plot more depth. Effective Formula: "Masti" appealed to a broad audience by skillfully fusing elements of romance, humour, and suspense. This recipe played a key role in the movie's financial success. "Masti" not only did well at the box office but also made a lasting impression on Hindi film. It was essential in making adult comedy a commercial genre by enabling filmmakers to experiment with daring and obscene material. The adult comedy genre in Bollywood gained momentum as a result of the film's success, which prompted several other filmmakers to follow suit. Films such as "Grand Masti" (2013) and "Great Grand Masti" (2016) carried on the adult humour tradition while expanding the franchise. Still, the rise of adult comedy also sparked conversations and arguments concerning the definition and boundaries of humour in Indian film. Critics questioned whether or not such content challenged stereotypes and whether it was regressive or liberating. "Masti" and related films provided new opportunities for comedy in Bollywood, but they were not without criticism and difficulties: According to some critics, the adult comedy genre frequently relies on stereotypical depictions of women as objects of desire, thereby reinforcing stereotypes. The frequent portrayal of women as nothing more than tools of men's desires served to reinforce traditional gender roles. Objectification: These films' explicit humour frequently veered into objectification, which drew criticism for being insensitive to women. Content Quality: A few reviewers believed that the adult comedy subgenre had degraded cinematic standards by emphasising sensationalism over narrative and meaningful content. "Masti" was the first movie in the adult comedy genre, and it paved the way for a number of Bollywood films that followed. It defied the accepted conventions of Hindi filmmaking and dared to humorously examine taboo subjects. The success of the movie provided audiences with a new outlook on comedy and opened up new opportunities for filmmakers. The rise of adult comedy in Hindi cinema not only changed the way the industry approached humour and narrative, but it also generated discussions concerning objectification, humour, and how women are portrayed. The genre encountered difficulties in balancing sensitivity and entertainment as it developed. As a movie that dared to push the envelope and transform Bollywood, "Masti" will always be regarded as a landmark work that helped diversify Indian cinema by paving the way for new stories. Unquestionably one of the first adult comedies in Hindi cinema, "Masti" had a huge influence on the genre. That was an important turning point in Bollywood's history because it gave directors the courage to explore provocative and daring subjects while defying the conventions of Hindi cinema. 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