Toph: Wait. It's a trap! Katara: Really? No kidding. Is that why we're sitting in a wooden cage right now? Gee, how'd you figure out it was a trap? Toph: Not for us, Katara. We're the bait. He wants Aang.
Played straight with Zuko's completely sincere declaration that:
Zuko: Doing nothing is a waste of time!
Katara: Haru has a gift! Asking him not to earthbend is like asking me not to waterbend!
In "The Great Divide":
Man: You wouldn't be so calm if the Fire Nation destroyed your home and forced you to flee! My whole tribe has to walk thousands of miles to the capital city of Ba Sing Se. Katara: You're a refugee! Man: Huh, tell me something I don't know.
Hakoda: Everything okay?
Katara: We're fine, dad.
Hakoda: [Offering his hand to Aang] I'm Hakoda. Katara, and Sokka's father.
Katara: He knows who you are. I just called you "dad," didn't I?
Nightwing in Batman: Under the Red Hood partly because he likes to chat and Batman doesn't talk so much so Nightwing just states the obvious as a way to pass the time.
Also played for laughs (and dissimile) with the Black Mask:
Black Mask: "Maybe my last request was too mired in subtlety. I want this man dead. When I say dead, I mean seriously dead. Beaten, broken, his-head-mounted-on-my-wall kind of dead!" Ms. Li: "Understood. We'll be taking further precautions at every transaction-" Black Mask: "Screw that! Time he learns that this is a contact sport! We're going on offense. Rough up his business. Something big! Something loud! When he shows up to shut us down, have a party waiting for him! And when I say party, I actually mean A WHOLE LOT OF PEOPLE WHO ARE GONNA KILL HIM!" Ms. Li: [deadpan] "I figured." Black Mask: "Just being clear."
An inversion in Cars 2, when McQueen warns Mater that he's not at home and implies to him that Mater should behave appropriately. Mater responds that it is quite obvious he's not at home and thinks McQueen is acting as Captain Obvious.
McQueen: Look, Mater, we're not in Radiator Springs.
Mater: You're just noticing that? Boy, that jet lag really done a number on you.
Number 1: But if you're my uncle, then that makes Grandfathermy grandfather!
Father: What are you — President of the Obvious Club or something?
Courage the Cowardly Dog was like this during some early episodes. Though he did this less frequently as the season went on, it contributed to the decision to limit his speaking abilities in the following seasons.
Dora the Explorer and children's educational TV in general tend to state the obvious. Justified, as a lot common sense knowledge we take for granted aren't privy to many children yet.
Family Guy had one episode that consisted of this:
Zoidberg: Strange. Why would Nixon, an awkward, uncomfortable man, suddenly throw a party, one of the most social events imaginable? (snaps claw.) It's a trap, is why! They're going to deactivate all the robots! [beat] I don't hear any gasping. Leela: We already figured that out.
From "Love's Labours Lost in Space":
(The Professor activates a holographic projection of a planet with the words "VERGON 6" written in large bold type underneath)
The biggest offender was Velma's line in the Green Ghost episode:
"They went out the door!"
In many episodes, after unmasking the bad guy, the gang would all shout in unison who it was.
One episode of The Simpsons had Homer attempting to play "Horse Whisperer". His advice? "When the race starts, run real fast!"
And one can't forget, Ralph Wiggum's "My cat's breath smells like cat food."
Ralph Wiggum is, naturally, a goldmine of these. This is the man who brought us "Fun toys are fun!"
Another Ralph gem: "All my friends have birthdays this year"
Dr. Marvin Monroe proposed an experiment wherein he would raise a baby to adulthood in a sealed box, providing it only with basic nutrition, along with the occasional icy shower or electric shock. His theory: "The subject will be socially malajusted, and will harbor a deep resentment towards me".
There was also a scene in the episode "Homer vs. Dignity": When Homer in the panda suit is repeatedly shocked with a cattle prod, Lisa exclaims, "Something's wrong! Terribly wrong!" No, really?
"Wait a minute... THAT'S not the wallet inspector..."
In one episode, Homer's own brain has to remind him "Money can be exchanged for goods and services."
Marge: "Cannons are designed to hurt."
Marge: "Maybe [what's in your hair] is just shampoo. That washes right out."
After Lisa's goalkeeping results in a shining victory for her team, Marge praises her performance: "By blocking the net, I really think you helped your team!"
Bart: "What good's a credit card if you can't even use it?" As opposed to what else you'd do with it?
Don Vittorio in "Homie the Clown": "To murder a funny man of such genius would be a crime!" Although he may have meant a crime by mafia standards.
Also, a slightly subtler example from the episode "Bart's Inner Child", overlapping Exposition:
Homer: Well, here we are at the Brad Goodman lecture.
Lisa: We know, Dad.
Homer: I just thought I'd remind everybody. After all, we did agree to attend this self-help seminar.
Homer: And what are you charging for this free weekend?
Played straight in South Park where he takes on the form of Captain Hindsight.
The line from an episode of South Park, which Randy delivered like it was a huge revelation.
Randy: If we're still alive in the morning, then we'll know that we aren't dead.
The Coon and Friends saga has an actual super hero, Captain Hindsight, who arrives at the scenes of disasters to point out that the accident could have been prevented and then leaves. Usually the rescue workers then pack up and leave as well.
Invoked on one episode of SpongeBob SquarePants, where Dr. Gill Gilliam announces in the sombrest of ways that Gary is, most definitely, a snail.
In early Super Friends episodes, Robin had a way of pointing out the obvious, usually in the form of his overtly religious catchphrase. This is the third post in a row about Robin.
In Teen Titans, about every time the alarm goes off, one of them says "trouble". Really? I never would have guessed.
Timon and Pumba The Series — Timon and Pumba volunteer for a circus act and must follow orders from an obviously psychotic clown who puts them in ever more dangerous predicaments. After avoiding death numerous times, Pumba makes this comment.
Pumba: "What I still don't know is, why is he called Mr. Meanie?"
Oh, boy. Transformers Armada. These kids probably had a lot to do with the Transformers fandom's dislike of human characters in general. A great deal of the time, their role in an episode was to spend half an hour giving statements like this:
Optimus: [Gets hit, falls down]
Alexis, [to Rad and Carlos, who are standing right next to her and watching the same fight] Oh, no! You guys, Optimus is down!
Rad: Oh, no!
And then Transformers Energon came along. Mostly it was due to an incomplete translation, though. Time would often be filled with Optimus saying to people who probably have some idea as to why they came to some dangerous place locked and loaded, "Remember, our mission is to protect the planet/Energon/injured character." Also, the first third or so of the series consists of episodes in which bad guys will steal a cache of Energon that the good guys just discovered. Every single time, someone (maybe more than one someone) will say "They're after our Energon!" Similarly, the bad guys would talk about their plan and say "We need more Energon!" as if they'd just come to the conclusion. In fact, all of the repetitive dialogue that plagues the series is delivered as if it's something that's just dawned on the person who has said it twice already.
Winx Club, after Nabu's death and Ogron teleporting away: "He disappeared!" Thanks for the tip, Riven.