Bone conduction dentist chair
Being a dentist can be tough enough as it is, but do you really want to have to explain to your patients that no, they don't need to wear headphones if they want to listen to music because your new dentist chair has a built-in CD player and uses bone-conduction to create the sound they'll enjoy? Just tell 'em it has a built-in speaker or something because seriously, telling people you're going to use ultrasonic waves to vibrate their skull to create sound just doesn't work. Hopefully Yoshida Seisakusho KK, (the Japanese company that is hawking these) will have better luck over there where things are, you know, different.
