Reminds me of the blonde motorist who was stopped for speeding by a female police officer, who was also blonde.  The officer asked to see the motorist's driver's license.  After fumbling around in her purse, she plaintively asked the officer,

"What does my driver's license look like?"  The officer replied,
"It's square, and it has your picture on it."  So the motorist, finding her square compact, looks at her image in the mirror and hands it to the officer.  The officer studies it carefully, looks at the motorist, hands back the compact and says,

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