It's a reference to Penny Parker and how it takes just a smile from her to get a man into trouble. In that episode, she becomes involved with someone whose uncle has been skimming money from a government job... and stolen the crown jewels of the country to boot. The nephew gives them to Penny, not knowing how important they are, and then very sternly for them back. But in the meantime, she gets Mac involved as well... and as they say... the rest is history.
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