We have motion sensors in our office for more economic usage of lighting. Most of my colleagues have left but I haven't had my daily fill of Net surfing. That's why I'm still here. Being motionless most of the time, the sensors often mistake the room as empty (it's happening this very moment...again!) and begins to dim the lights before finally switching them off. Not all the lights are connected to the same sensor, luckily! All I need to do is make some meaningless movements & lo...there's light!
There we go again! Gotta do those motions.