A blonde takes her car to a garage. She asks if there's any way they can fix the hail damage on her hood.
Seeing that she was blonde, the mechanic decided to have some fun with her. He tells her, "Well, I'll let you in on something. I'll tell you how to do it on your own, and it will cost you nothing. Go home, and blow as hard as you can into the tail pipe. Then the dents will pop out!
"Excitedly the blonde goes home and parks her car in the driveway and begins to blow into the tailpipe.
Another blonde walks by on the sidewalk and asks what she's doing.
The blonde explains what she's doing and the other blonde yells,
"Gosh! It's blondes like you that give us a bad name! Anyone knows that you have to have the windows rolled up first!"