A blonde crashed her car multiple times, and it was covered in dents, so she took it to the garage. The mechanic told her to take the car home and blow into the exhaust pipe so all the air pressure inside the car pushes out the dents in the body work. So she went home, and blew into the exhaust, but nothing happened. Then her friend came and asked her what she was doing. Im inflating the car by blowing in the exhaust pipe to get rid of these dents. Her friend, also a blonde, replied: Duh, youre supposed to wind the windows up first