A shiny protuberance was found in photos sent from the Mars Curiosity rover and it has caused quite a bit of speculation on various "alternative media" blogs and on-line discussion forums. This is the first explanation I've seen that makes any logical sense.
Source: Universe Today
images from the Curiosity rover showed what looked like a piece of shiny metal sticking out from a rock. Some of our readers suggested that it might be a handle or knob of some kind. It’s a knob, yes, says Ronald Sletten from the Mars Science Laboratory team, but a completely natural formation.