I woke up yesterday morning and was walking around my room in that early-morning daze when you're not sure what time it is and can't find your glasses or contact lenses. I looked out into the courtyard, and saw somebody wearing a blue jacket sitting in one of the chairs. This was a little irritating, since I wasn't wearing my underwear, and now I had to go find some underwear.
Only later did I figure out the person in a blue jacket was actually a reflection of the blue sky bouncing off the black surface of my windowsill. That's the oldest trick in the sky's playbook, and I fell for it.