A blonde, a brunette, and a red head were walking to a picnic across the Mexican border. When they arrived at the border, an officer stopped them. He asked them where they were going and they told him that they were going to a picnic. The officer then asked the brunette what she was bringing to the picnic. She told him that she was bringing some wine in case they got thirsty. So the officer said that she could go, and she did. Then the officer asked the red head what she was bringing to the picnic. She said that she was bringing some food in case they got hungry. So the officer allowed her to go. Then he asked the blonde what she was bringing to the picnic. The blonde replied, "I'm bringing a car door in case we get hot. Then we can roll down the window."