It has finally happened to me. Got off of the bike (98 Tourer) in the garage after a 150 mile ride. Went to walk around the front of the bike and stepped on something. Looked down and saw this!

Pretty sure that it did not came off the bike, but did it? That is a quarter next to it to show this size.
My first thought was that is is a mirror spring but it is too big and there is nothing wrong with my mirrors.
Any ideas??