Shooting my brand-new Nikon D800 for the first time (a few weeks ago), I had the tripod set up, popped the lens off, and a moment later observed a fat fuzzy little insect sitting on the ground-glass.
With a little effort, I blew the little bugger out, but my ground-glass screen now has little fuzzy blobs on it. How’s that for a brand-new camera? Bummer. Not sure if I can replace or clean the screen myself.