A blonde cop is patrolling the highway when she sees a blonde motorist weaving in and out of traffic.

The cop pulls over the motorist and asks for her ID. Note that the motorist was wearing a pink ensemble and that the cop was in uniform when the incident happened.

Cop: May I see your ID, ma'am?

Motorist: What's an ID?

Cop: It's a rectangle with a picture of your face on it.

The motorist digs around her purse and pulls out a mirror. The cop takes it, thoroughly examines it, and hands it back to the motorist, saying:

"OK, you can go. I didn't realize you were a cop!"