Wacko is an American half-hour children's television series that aired on CBS on Saturday mornings. The show was a live action variety show featuring skits and musical numbers. The show only had 10 episodes, from September 10, 1977 through November 12, 1977.
One recurring skit was called "Clown Doctor", in which a doctor (that happened to be a clown) would call for his nurse by yelling "Noiss Noiss". The harebrained nurse would enter, causing Clown Doctor to point at his forehead (with a camera close-up on him) and say, "Nobody home... vacant".