It traps you in your own house... then pulls the plug.
The electrical appliances in an average suburban home go haywire, subtly beginning to control the house's human inhabitants. A visiting teenager realizes what's happening and tries to warn everybody, but no one gives credence to his crazy theory. When people start believing, it's already too late. The possessed appliances will brook no resistance in their march toward world domination and soon begin attacking the helpless mortals at the most vulnerable moments of their everyday lives.