Instead of ATMs at grocery stores beeping, they could play notes of a song. They'd be linked up to the other ATMs so instead of this cacophony of annoying beeps you'd hear a pleasant little musical piece that everybody who's checking out would be taking part in playing.
It wouldn't matter which button you pushed or when you pushed since it would just enable a pre-sequenced note to be heard. Aisle 1 is the violins, 2 is the cellos, 3 is the clarinets etc. (All playing staccato of course)
Play Handel's Messiah while buying pork rinds.-- doctorremulac3, Sep 30 2007random, halfbakery