From ShArE ThE LaUgH:
This blonde cop stops a blonde driver and asks for identification.The blonde driver looks all around in her purse and can’t find her license. “I must have left it at home, officer.”“Well, do you have any kind of identification on you?” asks the cop. …The blonde takes out a pocket mirror and says, “I do have this picture of me.”“Let me see it,” says the cop. She holds up the mirror and looks in it.
Then she says, “Sorry. If I had known you were a police officer, I wouldn’t have stopped you.”