State Trooper

A woman is driving through rural Pennsylvania when red and blue lights come on in her rearview mirror. The officer approaches the vehicle.

Officer: Ma'am do you know why I pulled you over? Woman: Ya, you wanted to invite me to the policeman's ball! Officer: Ma'am I am a Pennsylvania State Trooper and we don't have balls.

There was a moment of silence..... The officer tipped his hat, returned to his patrol car and left.