I don't know if the Mr Microphone commercial memory was previously settled. Conan O'Brien's youtube recently uploaded a video of the Mr. Microphone inventor on Conan's show back in the 1990's and the inventor confirmed he wrote the line "Hey good looking I'll be back for you later." Conan brought it up so it's likely Conan wrote that line in The Simpsons episode. I can now sleep easier.