Trip To The Desert

A red-head, a brunette, and a blonde went on a trip to the desert. They each brought one item for survival. The red-head brought water. The blonde asked, "Why?" The red-head replied, "To prevent us from dying of thirst." The brunette brought food. The blonde asked, "Why?" The brunette replied, "To prevent us from dying of hunger." The blonde brought a car door. The red-head and brunette asked, "Why?" The blonde replied, "To roll down the window if it gets hot."