Monster/Entity darkens the room somehow to make things scarier.
Alice and Bob are afraid of Joe Mc Killer, but know that they're safe from him here. Suddenly, the lights begin to flicker and go out - he's here! This is when a villain can darken a room seemingly at will. Whether they suck the power from the lights, or just plainly and inexplicably make them go out, it sure makes things scarier. Often leads to Darkness Equals Death. Film
They cut the power.
How can they cut the power? They're animals!
Hooper: He ate the light.