Fast moving vehicles lacking a roof, doors, a trunk, seatbelts, etc., are prone to stuff falling off them. No matter how dutiful you are in securing objects to your motorcycle you’re eventually going to lose something. Whether due to wind or vibration, a forgotten tab, unclicked lock, loose connection or unzipped pocket, something of value to you will find its way to a temporary roadside residence until found and claimed or junked by another.
Not all items listed are unintentionally lost, or lost due to unforeseen happenstance. Beginning with #10, an item for which most men are willing to pay to see lost.