Sony sends sound through your skin
 

Consumers who want to use their bodies as a transmission medium for sound have been sadly limited in their options. Using Hasbro Toothtunes, kids can feel The Cheetah Girls' "Shake a Tail Feather" vibrating through their tiny jawbones, but now Sony has developed a human body transmission system for adults—headphones that use the human body as their wire.

http://arstechnica.com/news.ars/post/20061128-8302.html