Sitcoms are one of the most popular kinds of television shows. They're also one of the oldest. Over the years, certain sitcoms have garnered astronomical ratings and have become legendary in the world of television. Many of them were given spin-offs in an attempt to capitalize on the shows' popularity. This way, the cash keeps on flowing after the original sitcom ends. These spin-offs usually take the show's most popular characters and storylines and expand upon them in their own show. We tend to think of spin-offs as a common, and overdone, practice today. But the reality is, they've been around forever.