During the run of the Hopalong Cassidy TV series, William Boyd began making PSA-style monologues at the end of each show where he spoke to his young fans directly as "Hoppy". The character of Hopalong Cassidy imbued such traits as fair play, honesty, courtesy, and patriotism, and Boyd felt strongly about sharing these beliefs with his young viewers. These monologues included subjects such as eating the right kinds of foods, getting plenty of sleep, being a good sport, minding your mother and father, respecting police officers, attending Sunday School, following the Golden Rule, and the ethical treatment of animals.
