The Thing at the Window

You live with your father in the rural American midwest. He left you home alone while he's out of town for the weekend, and you heard on the radio that there's a large storm heading your way. You live in a rather underdeveloped part of the country so you're off the power grid, but fortunately your dad's pretty handy and he's wired up your old farmhouse to a gas generator, which you moved to the b...