So there I was, unwrapping year-old Christmas candy for some photos, pondering the difficulties of salvaging the big, expensive candy canes that partially melted into one sticky mess. My Mac had fallen asleep after many hours of PhotoShopping, and I hit the spacebar to wake it up.
And got the screen you see. It took a bit of talking to, and a restart. All is well. It has been a long day. And yes, I lost at least three hours of work.