There's one camera accessory which you probably never, ever use — unless you're a professional who carries several cameras: the body cap. This protective plastic disk is most likely in the back of a closet somewhere, waiting inside the camera's box for the day you sell it and the cap is needed once again.
But Olympus thinks that it can tempt you with a fancy body cap. What's more, it thinks that you'll pay £70 for it (around $114). Behold: The 15mm ƒ8 "body cap.".