Submitted by “bg”.

Late one night Mr. Lupine needed a light bulb to read the newspaper. He found one in the closet and screwed it in. But when he turned on the lamp, it lit up the whole house. He drew the blinds and saw the whole world outside was lit up as well! He ran to the lamp to turn it off. With one turn of the knob, the dark returned outside.. With another turn, the light shrunk down to the space around his cozy chair. He sat down and read the news.