Quotes / Stealth Hi/Bye

"Okay, that's it. I'm putting a collar with a little bell on that guy."
Xander regarding Angel, Buffy the Vampire Slayer

"Sorry. I didn't see you, so I should have known you were there."
Buffy regarding Angel, Buffy the Vampire Slayer

"COR BLIMEY! Quit sneaking up on me like that!"
Yangus, Dragon Quest VIII

Rhea: Hey! What the— Where the hell did YOU come from?!
Death: That answer is somewhat complicated. Why not settle for a friendly "Hello"?

"Hi, Jackie!"

Harvey Dent: I knew the risks when I took this job, Lieutenant. (to Batman) How will you get him back any...
(Batman has already disappeared)
Lt. Gordon: (shrugging) He does that.

"There you are. You snuck up on me. Me. How do you do that?"

"Seriously, why do this year's freshmen keep on appearing and disappearing all the time? It feels like they're messing with us."
Riko, Kuroko No Basket

(Catwoman disappears)
Batman: So that's what that feels like.
The Dark Knight Rises (the exact same line is also used in Kingdom Come, when Superman pulls it on him or when the Flash pulls it on him in Justice League: The Flashpoint Paradox)

(Ziva appears out of nowhere)
Mcgee: You enjoy doing that?
Ziva: A little, yes.

Ms. Marvel: Where'd Nick Fury and his little gang of terrorists go?
Spider-Man: Where does he always go? He went poof. It's his super-spy trademark.

"Boss, you're very stealthy."
Tony (after Gibbs just appeared out of nowhere once again), NCIS

"Gah! Penny, where'd you come from!?"
Ruby, RWBY

Jim Gordon: Partners are equals, Batman! When have you ever treated me like your equal? Partners, for example, tell you their plans! They keep you informed! And they sure as hell don't walk out on you in the middle of a sentence!
Batman:...I've never been good at saying goodbye.

"Now I know how Jim Gordon feels."
Batman, after Huntress does this to him in Justice League International issue 26.

Agent Washington: Meet me at the ship.
Church: Okay, what's the (turns to look at Washington)
...signal. God dammit, I hate when they do that.
Caboose: Do wha - Hey! Where's Agent Washington?

Finch: Would it be too much to ask you to snap a twig?
Shaw: [obviously suppressing a smile] Not my thing.

In the distance, shimmering with the heat, there was a girl in a school uniform, her skin as white as alabaster, hair so pale that in the strange afternoon light, it looked blue. She gazed at him with piercing red eyes. Instinctively, he turned his head towards the screech of approaching tires. When he glanced back at the street, the apparition was gone.

Thank you again, Spectre. Spectre? He's gone.

Batman...? But... How... Where? WHEN did you get here? (muttering) Why do I even ask...?

One of these days, the two of us were going to sit down and have a nice talk about the wonders of knocking.

Okay, forget "who". WHERE are you two!?
Genie to the empty space where Roxas and Xion have just been, Kingdom Hearts: 358/2 Days

Boy #1: [takes a slice of meat from Nancy] Thank you, miss.
Boy #2: [takes a slice of meat] Thanks, miss.
Boy #3: [takes a slice of meat] Thank you, miss.
The Doctor: [takes a slice of meat] Thanks, miss!
[children panic]
Doctor Who, "The Empty Child"

She's broken off the wing. Okay, Clark, if you manage to keep your distance, she might need some heló I hate it when he does that.
Batman, Girl Power

Wanda: I know that he's Bruce Wayne, but how did he lay hands on a jet powered tank?
Harry Dresden: He's friends with most of Wayne Enterprises' mad science division.
Thomas Raith: (from right behind Harry's left ear) And he moves very quietly.
Child of the Storm spin-off Chaos Reigns