Six Feet Under is easily one of my favorite shows of all time, as it's completely character driven. The characters, themselves, are glorious spectacles. And among the many relationships that are formed and broken off in the five season run, none seem to match that of David and Keith. Together, they provide some of the most realistically presented issues a couple faces when getting together. While Nate and Brenda are two extraordinary pieces of work, they're often battling their own psychologies, philosophies, and major issues like Nate's terminal illness. With David and Keith, you get all the extreme with the incredibly mundane. It's real, it's intriguing, and sometimes it's wonderfully half-realized. There's a love-hate game at play between these characters, but it's never enough to keep them away from each other for good. David and Keith are the prime example of a relationship in TV land, but there's one couple that should never, ever be overlooked...