I can imagine the following scenario:
A woman saunters along the high street wearing a scarlet basque, fishnet stockings and high heels. A man in a shabby raincoat sidles up to her, says something, and hands her an envelope.
The boys in blue leap out of hiding and grab the guy and the envelope: which contains a card saying "WHY DON'T YOU GO CATCH SOME REAL CRIMINALS?"
Later they exchange contact details online, have a good laugh about it, and meet in a hotel for a paid shag.