A blonde was driving home and got caught in a really bad hailstorm. Her car was covered with dents, so the next day she took it to Kev the Panel Beater. Kev saw that she was a blonde and decided to have some fun. He told her to go home and blow into the tail pipe really hard and all the dents would pop out.
The blonde went home, got down on her hands and knees and started blowing into the tail pipe. Nothing happened. She blew a little harder and still nothing happened. Her room mate, also a blonde, came home and said, "What are you doing?"
The blonde told her how Kev the panel beater had instructed her to blow into the tail pipe in order to get all the dents to pop out. Her blonde room mate rolled her eyes and said, "Hel-l-l-O-O-O-O! You need to wind up the windows first!!.