Our boss walks around the office and turns off the lights after everyone. He also fines employees for leaving them on, but that’s not all.
Once, I noticed that very little water was flowing out of the toilet tank when flushing. As a result, you weren’t able to remove all your waste in one flush. I decided to remove the lid from the tank, and saw that there were 2 0.5 liter bottles inside. So the boss was saving one liter of water with every flush.