My choice would be "Occasional Wife," starring Michael Callan and Patricia Harty. It only aired for one season -- 1965-1966, I believe -- but it was a clever little show. Callan played an ad exec whose boss expected his employees to be married, so Callan's character employed his upstairs neighbor (Harty) to be his wife whenever he needed to keep up appearances. The situations were often hilarious. I'd give anything to have this cute show on DVD.