Another one of my all-time favorite shows. I watched Three's Company as a kid, and then again in syndication. In fact, I was named after Suzanne Somers, so I have a special affiliation with this show. Plus, John Ritter was so stinking funny. As a bit of trivia, he played the TV father of Kaley Cuoco-Sweeting (Penny) before he died.
80s and 90s honorable mentions: Taxi, Thirtysomething (the episode where the prof hangs out with Emily Dickinson is the one I remember most), The Tonight Show starring Johnny Carson, Tic Tac Dough, Talk Soup (now The Soup with Joel McHale), and Twin Peaks (which I watched after it's big season finale.)