Taxi (1978)

S3E10 The Costume Party

Bobby discovers an elegant briefcase left behind in his cab and, along with his fellow cab drivers, decides to sift through its contents to track down the owner. They stumble upon an appointment book filled with meetings with various celebrities and an invitation to a yacht cocktail party. Excited about the prospect of mingling with the rich and famous, they don their best outfits and sneak into the event. However, they soon find themselves surrounded by realtors rather than stars, leaving them disheartened and realizing they had misinterpreted the glamorous scene.