At bedtime on Christmas Eve, the family makes last-minute preparations at home, Marge tells everyone that no one can open their presents until 7 AM the next morning and confiscates all of the alarm clocks. However, Bart drinks 12 glasses of water to wake up early and unwrap his gifts, one of which is a remote-controlled fire truck. He plays with it until it sprays water on an overloaded electrical socket, causing a fire that engulfs and melts the plastic Christmas tree and all of the presents beneath it. Bart hides the evidence beneath the snow in the front yard.