Ever seen a drone fly at night? It's far creepier than you might imagine at first, especially if it's in the early morning, like 3am or something.
Well at night it's kind of hard to tell that it looks like anything. All you can see is just the blinking locator lights on it, and all you can hear is the buzzing of the props. But who knows what could be attached to the drone? Cameras? Some kind of gas?