What 1991 comedy film, starring Sylvester Stallone, centers on a mob boss attempting to go straight, whose day is thrown into chaos by a series of mistaken identities, unexpected arrivals, and his daughter's secret marriage?

The 1991 comedy film described is "Oscar," starring Sylvester Stallone in a notable departure from his typical action hero roles. In this madcap farce, Stallone plays Angelo "Snaps" Provolone, a notorious mob boss who, on his dying father's wish, attempts to abandon his life of crime and go "straight" to become an honest banker. The entire chaotic plot unfolds over a single day as Snaps tries to navigate his new, legitimate path.

The film's humor stems from the rapid-fire succession of misunderstandings and unexpected events that derail Snaps' efforts to reform. His mansion becomes a hub of mistaken identities, with various characters wrongly believing who is pregnant, who is engaged to whom, and who possesses various bags of money and jewels. Adding to the pandemonium is Snaps' daughter, Lisa, who complicates matters with her own secret marriage plans and a false pregnancy claim to gain independence, further entangling her father in a web of comedic chaos.

"Oscar" is a remake of a 1967 French film and is set in Depression-era New York City, lending it a classic screwball comedy feel. While it received mixed reviews upon its initial release, often noted for Stallone's unusual casting in a comedic lead, the film has since garnered a following for its energetic performances and intricate farcical plot. It offers a unique glimpse into Stallone's versatility as an actor, showcasing his ability to play a flustered straight man amidst an ensemble of eccentric characters.