Will Carlson, portrayed by Brian O'Halloran, is a young man in his twenties leading a hapless life in a dilapidated area of New Jersey. Struggling to scrape by, he works as a birthday party clown to cover the expenses for the nursing home of his mean-spirited and abusive mother, and to pay the rent for his own cramped room in a shabby boarding house. Despite the challenges that come with his job, performing as a clown offers Will a brief escape from his bleak reality: a world where bums lounge on his lawn, children hurl rocks at his vehicle, and nearly everyone he encounters—from pedestrians to waitstaff—treat him with disdain. However, in the midst of this pervasive misanthropy, Will possesses a genuine fondness for kids. Their sheer delight during their birthday celebrations brings him joy and serves as a refreshing contrast to the cruelty of the adults in his life. His closest companion is Syd Gilbert, played by Bryan Johnson, a former high school friend who toils away as a laborer and has ties to the local gangs.
Faced with financial instability yet unwilling to abandon his passion for clowning, Will hatches a daring idea to become a high-end "bachelor party clown." His unique offering allows men celebrating their last night of freedom to hire him alongside a stripper. He dons clown makeup and lingerie, tricking the unsuspecting bachelor into believing that a mix-up occurred—sending a male clown instead of a female stripper. Taking the moniker Vulgar the Clown, inspired by Syd's candid remarks about the risqué nature of the concept, he advertises his services in the classifieds. Soon, he lands a gig at a bachelor party at a nearby motel.
As Will arrives at the chaotic party—clad in stockings, garters, clown makeup, and a trench-coat—he is violently assaulted by a foul-tempered middle-aged man named Ed, whose violent demeanor is matched by that of his thuggish sons, Gino and Frankie. In a shocking turn of events, the three men subject Will to a series of brutal and humiliating acts, recording their assault. After their cruel entertainment concludes, they release him with a chilling warning: if Will approaches the authorities, his story will be questioned, given his choice of attire for the "party." Devastated, Will returns home, spending agonizing hours in tears as he tries to wash away his trauma.
In the aftermath of this horrific incident, Will sinks into a deep depression that threatens his precarious living situation. His landlord's demands for rent add to his stress, and he confides in Syd about the torment he endured, compelling Syd to keep it a secret. While he fights to regain some semblance of normalcy, he reluctantly honors a promise to entertain as a clown at a former client's child's birthday. However, the situation takes a dire turn when Will discovers that a hostage crisis unfolds at the celebration—an estranged father, facing a contentious divorce, has taken his own daughter captive and is threatening her life. With suicidal thoughts consuming him, Will pushes past police barriers, breaks into the house, and manages to subdue the violent father.
The dramatic turn of events is captured on camera, leading to headlines that declare Will as "the hero clown." The surge of public support provides him a lifeline, pulling him out of his despondency. Soon after, a local television producer, Martan Ingram, offers him the chance to host his own show. As Will's fortunes improve, he moves into a nicer neighborhood and invites Syd to be his roommate.
Yet the resurgence of media attention catches the eye of Ed and his sons, who are still ensnared in a web of crime. They confront Will, using a videotape of his assault as leverage to extort cash from him. Despite trying to pay them off, the threats persist, driving Will into a corner. Eventually, he makes a desperate decision to comply with their demands, agreeing to meet them at a motel for another "performance." However, he secretly plots to take revenge with Syd's assistance, who supplies weapons from a local dealer.
When the confrontation ensues, Will finds himself paralyzed with fear, unable to commit the act of murder against his assailants. A chaotic sequence of events unfolds, leading to an accidental shooting of one of Ed's sons. Gunfire erupts as another lowlife enters the fray, and a bloody showdown ensues, resulting in deaths that spiral into a dark farce. Ed's fate is sealed when he suffers a heart attack while fleeing from Will. Relieved and free from his past traumas, Will retrieves the incriminating tape, giving it to Syd for destruction. He eventually returns to his beloved children's television show, where he continues to spread joy, now armed with a renewed purpose and a clearer conscience.
