A student in tonight’s class brought up the story of an artist implanting an ear onto his arm (reminiscent of the ear on a Vacanti mouse). I did a bit of googling, and found his website (here). His name is Stelarc. Here’s his ear:
From the BBC:
The ear does not function, but he hopes to have a microphone implanted to allow others to listen to what his extra ear picks up.
More info on wiki.