So this is a little fun thing to do when you have friends in the car. For example, You can do it while pumping gas while your girlfriend is in the car waiting for you - she'll love you forever. She'll totally think it's cute. One time I did it so good that I hit my head on the windshield and broke it (surprisingly not my head though lol) I told my parents a semi flicked a rock into it... shhhh ;) read the rest of the story at: http://www.charlestrippy.com