Hula-Hopp, Conny (1959)

Conny Haller is a fun-loving teenager and a big music fan. She and her friends have formed their own band, which regularly performs at a venue called “The Colorful Crocodile.” American record producer John Newman is looking for a German host family for his son Billy, who is going to study music in Germany. With help from Dr. Berning of the International Student Exchange Service, he chooses the Haller family, assuming that Conny is a boy. To keep up the pretense and not lose her chance to travel to Honolulu, Conny disguises herself and passes herself off as a boy. Unforeseen circumstances force the young woman to invent a sister named Cornelia, who supposedly lives at a boarding school and with whom “he” supposedly doesn’t get along at all. When Billy’s father arrives unexpectedly, further complications arise. Tentative advances develop not only between the music publisher and Conny’s mother. Sparks also fly between Billy and Conny when, in a situation that forces her to, Conny confesses to Billy that she is really a girl. When Billy’s father learns the truth, he feels deceived, breaks off contact with Diana Haller, and wants to leave immediately with his son. Conny and Billy naturally find a way to prevent this.