The blonde cop says "I need to see your license". The blonde driver digs through her purse for awhile, and says "I can't find it. What does it look like?".

So the cop, making a rectangle with her hands, says "it's rectangular, and has your picture on it". The blonde driver searches through her purse but can't find it. She finally comes up with the only rectangular item, a small mirror.

She looks at it, shrugs, and hands it to the blonde cop. The blonde cop looks at it, shrugs, and hands it back to the blonde driver. "Oh, you can go" the blonde cop says.

"I didn't realize you were a cop".