Forty years ago this week, January 15, 1974, the soon-to-be hit sitcom Happy Days premiered.

Soon, the Fonz and “sit on it” would become part of American pop culture.

Although the show’s initial appeal might have ridden the success of the hit movie American Graffiti, (that’s probably why the producers used Bill Haley and the Comets “Rock Around the Clock” for the theme music) the show itself was based on a segment of Love, American Style. It would turn out to be a fun show at a time when there was a sitcom renaissance which included other shows like M*A*S*H, Barney Miller, Laverne and Shirley, Welcome Back Kotter, as well as All in the Family and Sanford and Son.