History Recap / BrooklynNineNineS4E20TheSlaughterhouse

* DetachableDoorknob: The ColdOpen sees Jake, Terry, and Charles questioning a robbery suspect named Marcos. When Jake goes in to interrogate him, the door handle falls off after it slams shut, locking them both inside the room. The door can't be opened from the outside and requires the precinct's facility services to unlock it. Jake then proceeds to FreakOut and hyperventilate, which unnerves Marcos enough to confess to his robbery, where Jake tries to brush it off as AllAccordingToPlan.
-->'''Jake:''' Boom! And that's how it's done! [[IMeantToDoThat I was faking the whole time!]] [[BlatantLies I could have stayed in here forever.]]
-->'''Terry:''' Good, cause facilities gonna be a couple hours.
-->'''Jake:''' WE'RE GONNA '''''DIE''''' IN HERE!

Also, Holt accidentally loses Amy's prized pen and decides to use it as an opportunity to teach his protege how to stand up for herself rather than rolling over to avoid ruffling other people's feathers.

* CommonalityConnection: Diaz and Lt. Hawkins bond over [[BikerBabe their mutual love of motorbikes.]] Then, Peralta and Lt. Hawkins bond over ''their'' mutual love of ''Film/DieHard''.

* WhatTheHellHero: Amy is all too willing to let her pen issue go to avoid conflict with Holt. Holt realizes that this isn't healthy behavior and decides to push her into telling him off for losing her pen so she can learn to be more self-assertive. In true Amy fashion, she takes to it with aplomb and then goes a step too far.

* CommonalityConnection: Diaz and Lt. Hawkins bond over their mutual love of motorbikes. Then, Peralta and Lt. Hawkins bond over ''their'' mutual love of ''Film/DieHard''.

* UnmanlySecret: Gender-flipped. The normally tough and unflappable Rosa is at a loss for words when Jake lets slip that she enjoys romantic comedies, particularly the works of Nancy Meyers, to Lieutenant Hawkins.

Jake and Rosa try and fail to bust Billy Ocampo, a diamond thief. In doing so, however, they also inadvertently ruin a months-long sting operation being conducted by a task force headed by Lieutenant Melanie Hawkins, a cop so tough even Captain Holt is intimidated. Trying to make amends, Jake and Rosa go back to Hawkins to help catch Ocampo and find themselves competing for an open slot on Hawkins' team.

* CallingTheOldManOut: Holt realizes that Amy will refuse to do this no matter how justified she'd be so he decides to push her into telling him off for losing her pen. In true Amy fashion, she takes to it with aplomb and then goes a step too far.

* CompanionCube: Gina calls Amy's pen "her best friend. I'm not being mean, she actually called it that."

* UnmanlySecret: Gender-flipped. The normally tough and unflappable Rosa is at a loss for words when Jake lets slip that she enjoys romantic comedies, particularly the works of Nancy Meyers, to Lieutenant Hawkins.

* TamperingWithFoodAndDrink: Rosa puts caffeine pills in Jake's water to make him all jittery. She also puts them on the half-and-half milk on the brake room, [[CrazyPrepared knowing he would drink that instead of coffee.]]

* TamperingWithFoodAndDrink: Rosa puts caffeine pills in Jake's water to make him all jittery. She also puts them on the half-and-half milk on the brake room, [[CrazyPrepared knowing he would drink that instead of coffee.]]

!!This episode provides examples of:

Meanwhile, Terry finds himself having to deal with Hitchcock and Scully suddenly becoming worst enemies and loudly, and destructively, disrupting work at the office. Charles joins Terry in trying to combine their respective experiences as fathers to try and solve the issue.

Also, Holt accidentally loses Amy's pen and decides to use it as an opportunity to teach his protege how to stand up for herself rather than rolling over to avoid ruffling other people's feathers.