Mac comes up with an invention for an ice-making machine. He teams up with a doctor, who wants to make a sandwich machine, and opens a skating rink. He hires Spike Etaks as a skating instructor, but becomes jealous when Spike spends all of his time skating with Tillie.; Tillie promises to bake a cake for Mrs. Biltops' sale. Trouble is, Tillie can't bake and her mother has always baked the cakes for her. This time her mother refuses. Tillie tries and fails and then Mac tries his hand at the task.; Tillie thinks Mac is a natural drummer and organizes a band. Tillie is the singer and Mac writes a song, "Pick a Paper Hat." The band keeps getting thrown out of the members' houses when they practice and they finally end up setting up in a barn.; Mac gets paint over his suit and goes to a costume party as a rainbow.; Mac goes to a phrenologist to get the bumps on his head read.; Tillie breaks a heel on her shoe. She and Mac get in trouble when Mac breaks the window on the door of a shoe repair shop.