 The iceman, in order to win Katie, hires a voice imitator, Professor Mockingbird, to simulate crooners from the back of his ice truck while the iceman lip-syncs.The scheme eventually backfires when Professor Mockingbird turns blue from the extreme cold in the ice truck, and gets sick to the point that he sneezes the top of the truck off, causing Katie to discover the iceman's ruse.Katie marries the Professor, being sufficiently impressed by his crooning ability (while replacing her radio with an electric refrigerator), while the iceman is finally won over by the spinster's cooking and baking and presumably marries her.