A cop sees a car weaving all over the road and pulls it over. He walks up 
to the car and sees a nice-looking woman is driving and smells liquor on 
her breath. He says, "I'm going to have to give you the breathalyzer test 
to determine if you are under the influence of alcohol." She blows up the 
balloon and he walks over to the police car.
After a couple of minutes comes back and says, "It looks like you've had a 
couple of stiff ones." She replies "You mean it shows that, too?"