4. 'The Simpsons'
Few people think of The Simpsons as a spin-off, but it actually began its life back in 1987 on The Tracy Ullman Show. These were crudely animated, short segments with very few laughs, but Fox agreed to give them a full show in 1989. Once The Simpsons became a cash cow, Tracy Ullman filed a lawsuit asking for a piece of the pie. She lost the case. Tracy Ullman Show vets Julie Kavner and Dan Castellaneta, however, continue to make insane amounts of money for voicing characters. On a recent Halloween episode, the modern-day Simpsons where visited by their crude past selves to demonstrate just how much the show has changed.