Obviously I have a feeling I forgot about lots of them but here are a few:
From ‘Time’s Up’:
(Sid shows Stella and Danny sad faces drawn all over a girl’s body)
Sid: There's no way she could have done all this to herself. Unless she was capable of drawing on her own buttocks.
Danny: I knew a kid back in the Bronx who could blow out a candle with...
Desperate Stella interrupting: What about stomach content?
(Danny gives her a disappointed look – why don’t you want to hear my fascinating story? :guffaw
‘Till Death Do We Part’:
(Stella and Aiden just arrived at an old monastery and Flack’s telling them a hand was found inside)
A: You didn't find anything else?
F:I haven't gone in yet.
A: What?! Flack, you little scaredy cat. You don't believe these stories about this place being haunted?
F: I was doing my job, Aiden. Getting statements from witnesses.
A: Stella, you smell that?
S: Yeah, chicken. Uh, but I did hear the one about the monk who went crazy and killed the others is true.
F: (trying to defend himself) The One-Two-Two gets calls of strange noises coming from this place all the time.
A: Will you stop?? That's just an old urban legend.
S: Uh, Aiden, I think you'd better hold Flack's hand.
F: (pissed :lol
Yeah, okay. Cute.
From ‘Tri-Borough’:
Aiden: Anybody see anything?
Flack: When does anybody ever see anything?
Flack interrogating a suspect in ‘Grand Master’:
F: Well, forgive me if I allow your status as a multiple felon to color my opinion of you.
and then...
F: Last time I checked, the murder weapon we confiscated didn't have cute little legs, walking around from toolbox to toolbox.
'Stuck on You', one of my favourite episodes ever:
Flack: I've slept with a lot of women. Some wild, some crazy, some both.
Stella: (with a strange look) Excuse me?
F: Carlo's words. Not mine.
S: Ah.
F: Should have swung by the hospital to meet this guy. He's a piece of work. He calls himself the new American playboy. Lives, drinks, and breathes women. (Stella gives him another look)
F: Again, his words. So that in mind, as far as jealous exes go, lot of 'em.
S: I'd say Carlo emerges as our primary target.
F: Five minutes into the interview, I wanted to kill him.