Hart describing himself a "regular type dude with a big ass dick". And the way he casually takes a sip of coffee after it.
Every time Cohle starts philosophizing about man's inhumanity to man, Hart's "that shit cray" reaction is priceless, to the point where he makes his car a place of "silent contemplation," free of Rust's Wangst (although Hart ends up doing the same on numerous occasions).
And its variation, "What say we make the car a place of silent reflection?"
For a show that is decidedly murky and depressing, the moment in the first episode where Cohle stops an interview to demand a six-pack from the interviewing police officers is pretty good.
Cohle: Old Milwaukee or Lone Star. Nothin' snooty.
Hart and Cohle get another cop to call Hart's house during dinner and concoct a reason for Cohle to leave gracefully, given his apparent discomfort at being there. Halfway through dinner, just as the other cop calls, Cohle decides he's going to stay and keep expounding on his past to Hart's wife instead. The look on Hart's face when Cohle baldly turns down the alibi is priceless.
Towards the end of the initial interrogation of Dora Lange's ex-husband, Charlie;
Charlie Lange: Don't need no snitch jacket up in here.
Hart: *snorts* Gimme a break. This is Avoyelles. It's a goddamn day camp. Spend some time in Angola. Surprised you even have Aryan Nation here.
This bit between Hart and Cohle during one of their drives;
When Hart and Cohle investigate a brothel that the victim once worked at, Hart identifies one of the victims as being underage and on his way out, he gives her a handful of money, encouraging her to get out of that line of work. What does Cohle say?
When Quesada tells Cohle to shut the hell up, Cohle complies...but then mockingly raises his hand when he has something to say.
Quesada: Well, you're a smartass with your mouth shut.
During a conversation wherein Cohle outlines his plan to go back to Texas and work out a way at catching Ledoux, a drunken Hart puts on the former's leather jacket from his old undercover days. In the course of his explanation, Cohle shows Hart the wounds he took during a shootout shortly before being reassigned. When they've finished talking, Cohle heads off and Hart absently notices the bullet holes in his partner's jacket...
Hart's stay at Cohle's apartment after his wife finds out about his affair. Includes him getting coffee and watching Cohle's morning ritual of staring into his own eyes through a tiny, circular mirror with a perplexed look on his face, then later trying to do this himself and asking Cohle for clarification on how he's supposed to do it.
Possibly erroneous, but when Cohle meets with Maggie at the diner to discuss Hart, his shirt looks just like the one Marty's been wearing in the preceding scenes, seeming to imply that, for whatever reason, Cohle's decided to wear Marty's clothes.
Cohle and Hart, in two separate interviews, describing the falsified shoot-out that occurred at Reggie Ledoux's place in the exact same way. Complete with making sound effects and describing stunts straight out of an action movie.
Marty being refered to as the "human tampon" by his boss.
In the same conversation, Cohle calls himself "the person least in need of counseling in the whole fucking state." Sure Cohle, whatever you say. Subverted as of Episode 7 as it turns out Cohle was right and that there is a conspiracy.
Cohle and Hart get into a physical fight outside headquarters. Their colleagues rush out... And watch the show, some even egging Hart on.
Cohle: Nice hook, Marty.
Episode 7 is pretty dark all-around, but it has a good moment of levity when Gilbough and Papania are looking for the Fontenot farm...and get lost. Complete with them bickering about it like a married couple.
It's topped off in a Black Comedy way when they end up talking to a man implied to be the Spaghetti Monster, and not even realizing it.
Marty and Cohle disagree on how to question an old friend of Marty's, who they suspect about withholding information on a missing child case. Cohle suggests employing the use of a car battery and some jumper cables which Marty disagrees to. After Marty amicably says goodbye to his friend, having casually asked him about the case over a sunny round of golf, he calls Cohle.
Marty: Get the car battery. The motherfucker's lying.
Cohle's completely dumbstruck reaction when Marty cracks the case.
Marty and Cohle lazily flipping each other the bird when Marty visits Cohle in his hospital bed.
Marty had initiated this event by loudly slurping on a drink while Cohle was zonked out in bed.
Frank's response to being cornered by members of the Santa Muerte.
Frank: "That's one off the bucket list. A Mexican standoff with actual Mexicans."
As tense as their standoff is, Frank telling Ray that he's going to let go of his gun is capped off by one great Black Comedy line.
Frank: *points* "Don't you fucking shoot me Raymond."
Also, Frank and Ray both agreeing that they would rather not have to kill the other.
Frank: You might be one of the last friends I got left. Ray: (half smirking) Wouldnt that be fucked up?
Frank keeps getting snarkier as he falls further and further from grace.
Frank: "In the midst of getting gangbanged by forces unseen, I figured I'd drill a new orifice. Go on and fuck myself for a change."
Ray's attempts at helping Ani as she is coming down from a pure molly high.
Ani:I feel fucked up!
Ray:You want me to roll you a joint?
In the final episode, during a tense scene, Ani curtly refers to Frank as Ray's "gangster friend." Ray stops, shrugs and casually replies "He's actually not that bad of a guy" before getting back to the tension.