Tim, an ambitious executive looking to climb the corporate ladder, finds himself invited to a peculiar dinner hosted by his boss. The concept of the dinner is to bring the most eccentric guest who can be ridiculed for entertainment. Tim's fiancée, Julie, is against the idea, believing it to be cruel. Nonetheless, Tim wants to impress his boss and secure a crucial promotion. By chance, he meets Barry, an awkward IRS employee with a peculiar hobby of building elaborate dioramas featuring taxidermied mice dressed and staged in various human activities. Believing Barry to be the perfect guest for the dinner, Tim decides to invite him.

Barry’s arrival creates chaos in Tim's life, disrupting his relationship with Julie and complicating both his personal and professional existence. Barry’s well-meaning but clumsy nature leads to a series of mishaps and misunderstandings, testing Tim’s patience and moral compass. As Tim navigates through these challenges, he grapples with the growing realization of what truly matters to him, questioning his priorities and the kind of person he wants to be.