A blonde woman drives into a auto body shop and asks the mechanic if he can fix the big dent in her fender. The man was really busy, and feeling a little cheeky, so he just told her, "Actually Ma'am, you can fix it yourself. All you have to do is blow into the tailpipe and the pressure will force the fender to pop back out."
"Oh, thank you," she said, and went home.
Once there, she proceeded to kneel down at the back of her car and begin blowing really hard.
After a short while, her brunette roommate came out to see what she was doing.
"I'm trying to pop my dent out, but it doesn't seem to be working," the blonde said.
The brunette replied, "Oh, my gosh! You are *soooo* stupid sometimes. That will never work like that. You have to roll the windows up first."