Fred and Barney are neighbors, who both work for Mr. Slate at the gravel pit, and Wilma and Betty stay home. The Flintstones are a perfect alchemy of adult humor, outlandish plots and childish pranks. But the biggest ongoing series treat - the one that hooks each new generation - is the sight gag of dinosaurs performing as "modern" appliances - from lawnmowers to airplanes to vacuum cleaners to garbage disposals.