As Paul Vitti, portrayed by Robert De Niro, nears the conclusion of his prison term at Sing Sing, an unsettling urgency envelops him. With threats lurking from merciless assassins and corrupt prison guards, he desperately seeks solace in the show tunes of West Side Story, passionately serenading the iconic melodies to attract the attention of Ben Sobel, played by Billy Crystal, who had infamously cut their conversation short during the grief of his father's funeral.
The FBI steps in, sending Ben to perform a series of psychiatric evaluations aimed at discerning whether Paul is genuinely unhinged. At first glance, it appears that Paul's mental condition is declining, leading authorities to authorize his release into Ben's care for continued therapy. However, it doesn't take long for Paul to unveil the truth: he has simply been masquerading as insane.
Reluctantly complying with the FBI's directive, Ben permits Paul to seek out legitimate employment. Paul embarks on a quest for jobs at several establishments, ranging from a car dealership to a restaurant and a jewelry store. Unfortunately, his abrasive personality and escalating paranoia turn each opportunity into a comedic misadventure, ultimately resulting in his dismissal from every position.
In the meantime, Patti LoPresti, having assumed the role of the de facto boss, cautions Paul that the Rigazzi family has intentions to eliminate him. In response, Paul insists to the Rigazzis that he is "out" of their organization and is eager to explore new paths. He eventually secures a position as a technical advisor on a mafia-themed television series, further complicating his entanglements.
As tensions rise within the criminal underworld, FBI agents inform Ben that Paul has reunited with his former crew, hinting at a significant scheme brewing. This revelation incites Ben's suspicions, prompting him to confront Paul directly. Their encounter quickly escalates into a thrilling car chase, as they narrowly evade hits from the Rigazzi faction.
Following this chaos, the FBI holds Ben accountable for Paul's actions, imposing a 24-hour deadline for him to locate his former patient. Through the assistance of Paul's son Michael, who has taken on the role of chauffeur for his father, Ben uncovers Paul's plot to execute a grand armored car heist alongside LoPresti, who has her own dubious motives. Despite Ben's urgent pleas for Paul to reconsider, he is stubbornly met with resistance.
Undaunted, the crew embarks on their audacious heist, using smoke grenades to heighten the disorder and facilitate the lifting of the armored vehicle over a fence amidst the confusion. They effectively commandeer over $22 million worth of gold bullion, only to have LoPresti's men uncork their true loyalties - having been secretly aligned with the Rigazzi family from the start.
In a fit of rage, Ben channels his frustrations into physically confronting one of LoPresti's associates, signaling Paul's henchmen to engage and subdue the rest. Using the seized gold bullion, they orchestrate a trap against the Rigazzi family and manage to ensnare three of their goons, strategically suspending them within the armored truck precariously dangling from a crane. This calculated tactic leads to the mass arrest of the entire Rigazzi clan, averting the clash of an imminent mob war.
In a heartfelt moment, as Ben reunites with Paul and Jelly by the Brooklyn waterfront's iconic bridges, the trio shares a touching farewell, harmonizing perfectly to another classic tune from West Side Story. As the credits roll, audiences are treated to an endearing montage of bloopers, adding a humorous touch to the tumultuous saga that preceded it.
