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 an Asian man pointing and shouting), 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.
Similar comebacks:
"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, "You will find, young Skywalker, it is you who are mistaken. About a great. Many. Things."
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.
Doctor Who, "The War Games": When the animosity The War Chief and the Security Chief finally comes to a head, the War Chief confronts the other and makes a speech ending with "What a stupid fool you are." The Security Chief responds by playing a recording that proves the War Chief has committed treason, and makes a speech (in his strange line delivery) ending with "What! A stupid! Foooool YOU are!"
Viscount De Valvert: Base scoundrel! Rascally flat-footed lout! Cyrano: (taking off his hat, and bowing as if the viscount had introduced himself) Ah? And I, Cyrano Savinien Hercule de Bergerac.
In Drood one character responds to "You're next to an idiot!" with "Why, so I am, pleased to meet you!"
Saddler: Perhaps you are disillusioned with overconfidence just because you killed my small-time subordinate?
Leon: Saddler... you're small-time.
It should be noted that on certain Image Boards, the lameness of this comeback has undergone such a Memetic Mutation that it is in fact now a grievous insult.
At this point they'd been hiding in the Assassin Sanctuary for weeks, not allowed to go outside for more than 10 minutes, and they were starting to get a little crazy.
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!
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!
Poggle the Lesser: You are sentenced to death by firing squad. Padmé: No, you're sentenced to death by firing squad! Poggle the Lesser: No, actually you are. Padmé: The defence rests.
Bobeyes: OGEE! That was! Mine! You! What! Why?! OGEE! City Face: Look, there is plenty left, strange shouty magpie, you can have some it is really quite good! Bobeyes: No! You!
In "Welcome to Republic City" Korra is not that good with the verbal wit when engaging a member of the local Muggle Power movement.
Protestor:Benders like this girl only use their power to oppress us! Korra: What? I'm not oppressing anyone! You're—You're oppressing yourselves! Protestor: That didn't even make sense!
In "The Spirit of Competition", an unhappy Bolin gets one, but he has the excuse of being "drunk" on his Comfort Food:
Mako: I told you that dating a teammate was a bad idea. Bolin:You're a bad idea!
News Reporter:...a question being asked by the poorly educated, with fingers far from the pulse of the community. Randal:You're poorly educated! Dante:You're talking to the television.
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.
Regular Show, when the two are pretending to be astronauts.