Describe No You here.
Your face is describing No You here!
The act of replying to an insult by simply saying "No, you!" or something similar, meaning that said insult applied more to the person giving it than the person receiving it.
Omnipresent in schools, especially middle to high schools.
On the internet (where it's invariably written as "NO U" and frequently accompanied by an Image Macro of either an Asian man pointing and shouting or Mario's "NO" line from Hotel Mario), it is used as a sarcastic way of pointing out that a troll's comments apply more to himself and is therefore a hypocrite and idiot (i.e. to troll trolls). It may also be done by people who particularly don't care for the person's attempt in riling them up and use "NO U" as a sarcastic retort to the taunting.
"I know you are, but what am I?"
The childhood classic, "I'm rubber, you're glue, whatever you say bounces off me and sticks to you!"
"You are the one who is X!" and its variant, "It is you who is X!"
Later, in Return of the Jedi, when Luke told Palpatine he was mistaken to think the Empire would defeat the Rebellion, Palpatine answered, "Oh no, my young Jedi. You will find, that it is you who are mistaken. About a great. Many. Things."
Kíli in The Hobbit shows the emotional range of a seven-year-old when he and the other dwarves mistake Bilbo's claims that the dwarves had parasites to buy them time from being eaten by trolls as Bilbo betraying them.
Minos: "You have no power over me. I am the lord of the spirits! The ghost king!"
Nico: No. I am
In the Warrior Cats novel The Last Hope, the heroic Brambleclaw has captured his treacherous brother Hawkfrost. Ivypool, Hawkfrost's former apprentice, calls him a traitor, and it shows just how out of it Hawkfrost is when he, the largest ham in the series and eternal master of banter, can only reply with, "You're the traitor."
The Janitor: Really? (takes out a globe) Point to Iraq.
J.D.: Why do you keep a globe on you janitor cart?
The Janitor: In case I get lost. I'll give you a hint. It's not the country shaped like a boot.
J.D.: (points to a country) That's Iraq.
The Janitor: That's China.
J.D.: You're China! (walks away)
The Janitor: ...That's an outrageous accusation.
Whilst in Africa for an epic road trip, the Top Gear boys put on some local clothing to protect themselves from the dust, and mockery ensues:
May: [to Hammond] You look like a gay cowboy and [to Clarkson] you look like a gay terrorist. Clarkson: No, you look like a terrorist. With a broken windscreen wiper. And your face is ridiculous.
Comes up now and then on How I Met Your Mother, usually just to dismiss someone rather than in response to an actual insult: "You're a 'big sustainable growth'!" (in response to Marshall claiming the gang will start liking all his charts again) or "You're a 'tropical depression'!" (in response to Ted trying to get the gang to take the hurricane warning seriously)
One of the reasons Matt from Primeval is often viewed as The Scrappy is because his comebacks and self-justifications when challenged are always kinda lame. This culminated in the following exchange between Matt and Designated Villain Philip.
Philip: Look around you, Matt. The world didn't end. You were wrong.
Matt:You were wrong. You.
Quoth Michael Westen, to a criminal he just went up to yelling and pretending to be the boss of the dirty cops the guy has on the payroll, upon being asked whether "he's crazy or something?": "No, you're the one who's crazy. You're the one standing around, after letting your truck get stolen from your parking lot. You know, the one with the ecstacy lab inside?"
In one episode of The Suite Life on Deck, Woody gets addicted to a simulation game called Better Life(presumably a spoof of Second Life).
Woody: I was about to go down to Zack's Better Life arcade. I'm going for the highest score in virtual virtual bowling!
Cody: Don't tell me you're into that stupid fake world too.
Woody: You're stupid!!
"The Dumb Song" by Psychostick "Hey Murph, yer dumb!" "No yer dumb!" "No yer dumb!"...
The parody song "Metal By Numbers" has a dad and son arguing in the video, with the line "You're the news!".
Marik: Hey, shut up [Melvin], you don't know anything about me! Bakura: Marik, he IS you. Marik: He is the gay one! Bakura: Marik, HE'S YOU! Marik: ...He is the gay one!
And another example:
Johnny: Are you ready to lose to Johnny Steps? Tea: You are the one who is going to lose! Johnny: You're going to be so embarrassed, you'll wish you never stepped on my stage! Tea: You are the one who is going to be embarrassed!
And yet another example, from Marik Plays Bloodlines:
Marik: Oh, hey, it's one of those things, ah, what do you call them... something-waiter...uh, Bakura: Dumb. Marik: You're dumb! Bakura: No, the word for it is dumb! Marik: The word for YOU is dumb! Bakura: No, no, Marik! The thing you are in right now is called a dumb-waiter! Marik: You're the dumb waiter!
BM: What did you think I meant every time I said I was going to burn the world? RM: Who cares? Thief: Yeah, you're a wiener. You couldn't burn a match. BM: Yeah, well... Your face... is ugly... Shut up!
Deithard: "Oh, it's you two idiots. What do you want?"
Jeremiah: "You're the idiot." I am so good at come backs.
In Team Four Star's Halo: Reach LP they discuss the concept of Space Europe which is shot down with "it's a massive land", to which Kaiser Neko responds: "No, you're a massive land."
This is how the 2chShift-JIS cat Mona came to be. One poster created a word art image of a cat saying "You people have too much free time." Another poster copied the image and changed the phrase to "So do you!" (Japanese: "Omae mo naa!" hence the name) and things kinda snowballed from there.
Ultra Fast Pony combines this with Prince Blueblood's Shatner-esque speech patterns, to odd effect.
Blueblood: I believe that goes against... several, safety regulations! Rarity: Shut up. Blueblood: No! ... You!
In Justice League's first season, the team finally manages to bring down Luthor once and for all by pulling a sting using the Martian Manhunter's shapeshifting abilities. After the ruse is revealed and the evidence has been gathered, Manhunter remarks "It's the end of an era," to which Luthor replies "The end of your era, maybe" before attempting to kill them.