Launched in 1978, Mr. Microphone was a low-power FM modulator that turned radios into annoying precursors of the karaoke machine. The TV commercial featured Popeil's daughter and her boyfriend driving a convertible and using Mr. Microphone, which made one wonder why he didn't follow this invention up with Mr. Earplugs. Maybe it helped that he sold more than a million of them at $19.95.