Curiosity rover takes image of a metal object with wires protruding...August 31st 2012

Looking through the latest images i stumbled upon this gem.

Its quite clearly not a rock. What rocks have perfect circular holes with wires poking out of them?

To me it looks like it was attached to something. The area around the circular hole is concave like something fitted into it. The wire casts a shadow beyond the shadow of the main part of the object. I have no idea what it is to be honest, all i know is that this is not a natural part of the martian landscape.

http://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=NLA_399627657EDR_F003...