The story begins with Paul Morse (played by Jason Lee), a mild-mannered young man who is about to get married to his fiancée Karen (played by Selma Blair). However, the night before his wedding, Paul’s friends throw him a wild bachelor party, during which he meets a mysterious woman named Becky (played by Julia Stiles).
Paul wakes up the next morning with a hangover and little memory of the previous night’s events, only to discover that he has drunkenly married Becky. Panicked and confused, Paul tries to keep the marriage a secret from Karen and his family, fearing that it will ruin his impending wedding.
As Paul tries to sort out his complicated situation, he finds himself drawn to Becky and conflicted about his feelings for her. Meanwhile, Karen grows increasingly suspicious of Paul’s behavior and begins to suspect that he is hiding something from her.
In a series of comedic and increasingly chaotic mishaps, Paul struggles to navigate his way through the tangled web of lies and deceit, as he tries to keep both his marriage to Becky and his relationship with Karen from falling apart. Along the way, he receives advice from his eccentric best friend, Ray (played by Shawn Hatosy), and seeks guidance from his older brother, Jim (played by Lochlyn Munro).
As the truth threatens to come out and tensions reach a boiling point, Paul must come clean about his feelings for Becky and confront the consequences of his actions. In a climactic showdown, he must choose between following his heart and doing what is expected of him, risking everything for the chance at true love.
In the end, Paul realizes that he cannot continue living a lie and decides to be honest with both Becky and Karen about his feelings. With the support of his friends and family, he faces the consequences of his actions and learns valuable lessons about honesty, integrity, and the importance of following one’s heart.
“A Guy Thing” is a lighthearted and charming romantic comedy that explores themes of love, commitment, and self-discovery. With its witty humor, endearing characters, and heartfelt moments, the movie offers an entertaining and relatable portrayal of the complexities of modern relationships.