Two brunetts and a blonde are walking through the desert. The second brunette and the blonde ask the first brunette why she is holding a fan. The first brunette says" I'm carrying this fan so that if I get hot I can just turn it on and cool down."
After walking for about a mile. The first brunette and the blonde ask the second brunette why she is holding a waterbottle. "So I can just take a drink and cool down." says the second brunette.
After another mile, the second and the first brunette ask the blonde why is she carrying a car door. The blonde says "This way, if I get hot I can roll down the window."