A friend with a D800 took camera in for focus checking and Nikon Canada pronounced "impact damage" to the lens mount. He is extremely fastidious about his gear and could recall no impacts of any nature. Hmm.
Since this is rapidly devolving into a "photoaccident" thread, this:
Sitting in a RHIB (rigid hull inflatable boat) in the Pacific Ocean a few hundred miles off the coast of Costa Rica, I was photographing swimmers who had recently dived off the warship that loomed high above me. One of the sailors yelled from high above, "Hey Peter! Watch this!" Whereupon he cherry-bombed me, drenching me and my $75K camcorder with warm salt water. Of course it instantly died.
No backup.
With the able assistance of the electronics boys aboard ship, I performed heroic surgery (we had nothing to lose), the net result of which was a camera that would record and play back its recordings, but which had no live viewfinder. It made for interesting times shooting interviews: frame shot, shoot, play back, adjust framing, shoot, play back, adjust framing... etc.
I fabricated a "sports" viewfinder from stiff wire and carried on shooting until we arrived in San Diego, where a replacement was waiting for me.
In the immortal words of Rumsfeld, "stuff happens".