Before karaoke, there was Mr. Microphone.
This is a classic commercial from the 1970s. Ronco was to the 70s as the various “As Seen on TV” items from Telebrands are to this decade. I’m not sure if it’s politically correct to laugh at 0:23 or not. I know that you wouldn’t see it now. This is probably the most famous of the Ronco/K-Tel mail order TV products. The commercial was parodied on an episode of the Simpsons (The one where Bart drops the microphone down the well and convinces everyone that a boy named Timmy was trapped down there.)