Obscurity factor: 10
Peter Christopher (Callan) is frustrated with his lack of progress at work - he seems to be hitting a glass ceiling. When he discusses it with his boss he learns that only married men are promoted, so he hits on an idea - why not enlist the help of his friend Greta (Patricia Harty) to pretend to be his wife? The premise is a bit creaky, but the show has some fun moments and really reflects the swing singles culture that existed back in the 60's. In the clip of the episode below (part one of 3), look for Jack Riley (Mr. Carlin from The Bob Newhart Show) as a rival executive.
This series lasted only 1 season and hasn't been released on DVD. There is some footage available on YouTube - this episode was uploaded by 2nicks.
Obscurity factor: 10 (not available on DVD, one episode and some random footage on YouTube, largely forgotten)