Water usage is probably my biggest. Living in a high desert, my wife and MIL see no problem with filling one side of the sink with hot soapy water to wash a few dishes because “that’s just how I’ve always done it”, to watering the grass and plants for hours. All of this makes me mental.
Right, it could happen to anyone, but it’s still possible to lower the chance of that happening, or at least limit the damage when it does happen.