Build a movie plot around this: When was Peggy convinced that Kelton was not right for her? During a school dance.
A:
14-year-old Danny O'Neil (Gabey Olds) is madly in love with his teacher, Miss Peggy Noble (Daphne Ashbrook). Given the fact that she is engaged to the cold-tempered and vicious gym teacher, Roy Kelton (Rick Rossovich), who is nicknamed Jackjaw for his constant threat of breaking his pupils' jaws, Danny goes through his school days somewhat uninspired and suffers in silence.One day, he oversees his geeky friend Lloyd Duffy (Adam Carl), who happens to live next door with his uncle Herb (Harry Morgan) and aunt May (Irene Tedrow), growing fruits with an experimental growth accelerator. Danny becomes enthusiastic of turning himself into a grown man with the same machine, in order to break up Miss Noble's engagement, as well as convincing her to give him a chance. Lloyd is reluctant to help him out, aware of everything that could go wrong, so Danny secretly uses the machine at night. He saw that the timing was perfect, considering that his parents will leave the house for a week. Unaware of the consequences, he turns into a 30-year-old man (Steve Eckholdt).The next day, Lloyd immediately starts working on a machine with the opposite effect so Danny will be able to return to his 14-year-old body soon. During this process, Danny visits the high school to pursue Miss Noble. When he arrives, he is mistaken as the school newest principal, Harold Forndexter. He not only impresses his assistant Louisa Horton (Loretta Swit) with the introduction of his new rules - which include having as much fun as possible - but also Peggy, who admires his youthful approach of life.Much to the dismay of Kelton, she agrees to go on a date with 'Harold'. Even though Kelton follows their every step, Peggy has a splendid evening with the new principal, and they almost kiss at the end of the night. During a school dance, 'Harold' convinces Peggy that Kelton is not right for her, and she breaks off the engagement. Immediately after, 'Harold' and Peggy become a couple. Kelton, refusing to accept this, tries to find out more on Forndexter, and...