Betty Boop - Baby Be Good 1935
Plot: This animated short film from Fleischer Studios features Betty Boop as a young woman who is trying to get her mischievous nephew, Junior, to go to bed. Junior, who would rather stay up and play, causes a series of comedic antics, much to the dismay of Betty. She soon learns that the only way to get him to sleep is to sing him a lullaby, but even that is not enough to stop his mischievous ways.