I guess I don't mind that so much as when people forget to shut the lights off when they go to bed at night.
A couple of years ago, I worked the graveyard shift. On the drive home, (it was about 3:30AM), the city was deserted. I noticed that someone had forgotten to shut off their lights. It wouldn't have been that bad if it was just a string or two, but whoever it was had a whole Griswold/Wizards in Winter thing set up. It was just weird seeing this huge display blinking to nobody. (I wonder what his neighbors thought).