Meanwhile, whilst detailing my car.....

YIKES! The forum format has certainly changed now hasn't it.
I was throwing a mini detail on my car today when I noticed the trim under the rear bumper was coming off. There is a 1.5" to 2" black trim piece that follows the underside of the rear bumper from one side to the next and follows the return towards front. It is actually about 4 pieces screwed into th emain portion of bumper. I noticed a fastener missing and the rest were very loose. Takes a 10mm socket and a few turns to reset. You may want to check yours.