Jake: Okay! We're gonna start off in teams. I'm sure everyone could use the extra help since this year's heist was so spur of the moment and no one had time to plan anything too complicated.
[flashback: 12 days before the heist:]
Jake: This year's plan is insanely complicated. Check it out.
[present:]
Jake: We will be selecting our partners with the help of a beloved Nine-Nine fixture, the big bag of loose teeth.
Rosa: What the hell?
Amy: Are those human?
Jake: It's evidence from a century of bar brawls. The story of New York is in this bag.
Sergeant Jeffords: The story of New York is gross.
Jake: Yeah, Terry, we live in a hell-mouth. Now, in this bag is a tooth with each of your initials on it. Who wants to root around inside and pick a partner?
Rosa: I'm not putting my hand in a bag of dirty, old teeth.
Jake: It's not dirt, it's old blood and dried phlegm. Who's in? No one? Are you really all that squeamish?
[flashback:]
Jake: Of course they're all that squeamish. It's part of my plan. I'll volunteer to reach into the bag so I can rig the selection process using...
this magnet. Pretty dope, right? I've also added metal fillings to certain teeth to ensure we get the pairings that we want.