2. Laverne & Shirley (1976-1983)
This Happy Days spinoff, starring Penny Marshall and Cindy Williams, saw a solid seven years of rating success. In fact, the show became the most-watched show in America in its second season, according to ABC News. In case you never got a chance to partake in a Laverne & Shirley marathon, the show is about two best friends and roommates, and their escapades as two single working girls living in Milwaukee in the late 1950s.
The stars of the show said they had no idea it’d be such a hit. Williams, who played Shirley, told ABC News, “I thought, great, I’m going to get to stay in town, not have to move out of town, which I was going to do, and I’ve got my rent for the next year. We had no idea.”