Care for a spin-off?

Care for a spin-off?
ABC Television via Wikimedia Commons
1974: With '50s nostalgia trending, the sitcom "Happy Days" premieres on television with "Rock Around The Clock" as its theme song. The show would run for 11 seasons, spawning two hit TV spin-offs in "Laverne & Shirley" and "Mork & Mindy" along the way, before ending on Sept. 24, 1984.