Charlie Chaplin's 12th film for the Keystone company was also his directorial debut, receiving co-directing credit with co-star, Mabel Normand. Chaplin plays a waiter in a seedy cabaret who is always in trouble with his boss, Edgar Kennedy, and at odds with another waiter, Chester Conklin. While walking his dachshund in a park during his lunch break, he rescues rich-girl Mabel from the clutches of a thief who has chased away her boyfriend, Harry McCoy. Charlie introduces himself as O.T. Axle, Ambassador from Greece, (the first of Chaplin's "impersonation" roles) and is brought home to meet her parents and receive their thanks, much to the chagrin of Mabel's boyfriend. He receives an invitation to return later for a garden party. The suspicious boyfriend follows Charlie back to work and discovers the truth. Back at work Charlie deals with a bullying customer, Mack Swain, by serving him a drink and knocking him out with a large mallet when Swain tilts his head back to drink. Later, at the garden party, Charlie misbehaves, getting drunk, flirting with Mabel and singing loudly along with the band. The boyfriend, watching from a distance is now determined to expose him. When Charlie takes his leave to return to work, Harry suggests that the party go slumming to the very cabaret at which Charlie works. When the upper-class guests arrive, they are treated like royalty by the workers and other patrons. When Charlie discovers them at his table he hides the apron he's wearing and sits down next to Mabel, pretending that he's another guest. When the boss scolds him for sitting down on the job, Charlie is exposed as a lowly waiter, much to the shock of Mabel and her father. A melee then ensues between Charlie and his pistol-wielding Boss, whom Charlie knocks out while Mabel hides under a table. Charlie protests his love for Mabel, but she responds with a final knockout blow.