i think its a good idea, but it would probably be overused the first few would be good, the next 100 would be perfect, and from then on, it would be old so i think it would be great but it wont be a lasting element of fun (no pun intended)
its a good idea, but mabye I could add sonthing. When you hear the sound on your speakers, it could also like create a sound wave, that in turn could be picked up by a microphone element!