There's a blonde, a brunette, and a redhead traveling
through the desert when their car suddenly stalls. They all get
out of the car and, upon realizing that it's not going to
start, they each take one thing from the car. The brunette
takes a bottle of water, the redhead takes a bag of food with
her, and the blonde takes the car door.
They begin to walk through the desert, and soon stop to
rest. At this point the blonde and the brunette turn to the
redhead and ask her why she brought the food. She
replies, "Well, in case I get hungry I'll have something to
eat."
They all think this is pretty reasonable and then the
redhead and the blonde turn to the brunette and ask her why she
decided to bring water. The brunette replies, "Well, in case I
got thirsty I'll have something to drink." They all decide
that's a good idea, too.
Finally, the brunette and the redhead turn to the blonde and
ask her why on earth she would take the car door. She
replies, "Well, I thought if I got hot I could roll down the
window."