Early morning, just arrived at work.
The day is dull and only half of the lights are on in our section of open-plan hell.
I walk over to the bank of light switches and hit the one that usually turns on the extra lights - they flicker on.
Chris, a coworker: "Hissss, it hurts us." and covers his eyes and cringes down behind his screen.
Well it brightened my day :)