A blonde was driving home was caught in a really bad hailstorm. Her car was covered with dents, so the next day she took it to the repair shop. The shop owner decided to have some fun and told her go home and just blow on the tailpipe really hard and all the dents would pop out.

So, she went home, got down on her hands and knees and started blowing into the car's tailpipe. Nothing happened. She blew harder and still nothing happened.

Her blonde roommate saw her and asked, "What ar-re you doing?"

She told her how the repairman had instructed her to blow in the tailpipe in order to get all the dents to pop out.

The roommate rolled her eyes and said, "Duh, Hello! You need to roll up the windows first!!"