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The Subtle Brooklyn 99 Reference In Chicago P.D. Season 9, Episode 6

"Chicago P.D." is six episodes deep into its 9th season, and things are getting interesting. It's a popular NBC police procedural action-drama starring talented actors like Jason Beghe, Jesse Lee Soffer, Marina Squerciati, LaRoyce Hawkins, and Patrick John Flueger as Adam Ruzek. The show started off as a spinoff of another successful NBC drama, "Chicago Fire," but has since found its own footing and established a solid fanbase of its own.

In Season 9 Episode 6, things are especially tense for Ruzek. First, he starts acting salty because he gets reprimanded for acting recklessly on the job, then whines about being "underappreciated" and "unable to 'serve and protect'"  instead of reflecting on his own mistakes. Later, he gets frustrated about some of the injustices that his mentor Sal Ortiz suffers because the health insurance (which he gets through his job) won't cover the medical care his wife needs. Amidst the serious subject matter, though, there is one bit of levity that is also a subtle shout-out to another one of NBC's hit cop shows.

Ruzek channels his inner Jake Peralta in the coolest way possible

The phrase "cool cool cool," as the show's own @NBCOneChicago Twitter account points out, is the obvious "Brooklyn Nine-Nine" reference that fans got excited about. Both shows are (or were) NBC darlings, so it's not surprising to see some crossover. The phrase was originally uttered on the hilarious cop sitcom by Detective Jake Peralta (Andy Samberg) who, in moments of emotional discomfort, says the word "cool" repeatedly, rapid-fire style, as a reflexive self-soothing behavior.

"Brooklyn Nine-Nine" is such an amazing and lovable show that it's not uncommon to hear fans spouting any one of dozens of humorous catchphrases that have evolved over the years. These include such famous phrases as "name of your sex tape;" Terry Jeffords (Terry Crews) talking in the third person, especially when talking about something he loves like yogurt; and pretty much anything ever uttered by Gina Linetti (Chelsea Peretti). But the phrase uttered by Ruzek on the most recent episode of "Chicago P.D." is by far one of the most catchy due to its elegant simplicity.