I worked at an office that installed automated leccy-saving light switches on their conference rooms, only they didn't save anything nor helped anyone. Instead of working as Manual Off/On by sensors, they operated as Manual On/On by sensors, so every time anyone was in the room they would turn on and only turn off if people were static for some time, only to auto turn themselves on again as someone flinched. And no way to turn them of for presentations. Bloody brilliant.