I do not own Naruto, Kishimoto does
Summary: Itachi, dead set on proving that he's not uptight, decides to play a prank. Unfortunately, it goes a little too far...
...
"Shisui?"

"Yes?"

"I heard that Izumo is doing something called 'The Self Improvement Plan'. What is it?"

Shisui looked at Itachi. "Well, basically, you ask people what your worst qualities are and you try to improve them."

"Oh," Itachi said. Then, "What are my worst qualities?"

"Itachi," Shisui said seriously, "you're only thirteen. Izumo is twice your age. You don't need to do the self improvement thing."

"But it's always good to improve yourself," Itachi said. Shisui sighed, knowing that he couldn't change Itachi's mind. Oh well, what harm could it do if he helped Itachi notice his flaws?

...

"Uptight my ***!" Itachi yelled as he punched the bark of the tree. It fell over. Itachi wasn't exactly strong...which made it all the more terrifying.

"Timber!" he heard someone yell. Itachi whirled around and saw Sasuke sitting on the ground behind him, eating an apple.

No, wait, it was a tomato.

"Sasuke, what are you doing here?" Itachi asked. Sasuke shouldn't have to witness his anger.

"Well, I was looking for you. Shisui said you stalked off after he told you your flaws, and I decided to let you take out some anger on the poor tree. At least we have some wood to build that tree house I've always wanted now."

"Well...I'm good now. Let's go." Itachi turned to march back to their house.

"Stop!" Sasuke said, and Itachi immediately stopped. Something in his voice...it was so much like Father's... "Itachi, you're not okay yet. You're still mad. Now, sit down so we can work this out." Itachi grudgingly nodded.

"Now, why are you mad?" Sasuke asked.

"Because Shisui said I'm uptight!"

"Why did he say you were uptight?"

"Because I asked him about my flaws."

"And why did you ask him about your flaws?"

"...so I could fix them."

"Exactly. Shisui tried to help you, now you need to do as you promised."

"But I'm NOT uptight."

"Sorry to say, Big Brother, but you kinda are."

"...stupid, traitorous Little Brother," Itachi grumbled, his arms crossed.

"Thank you, I do my best." Sasuke got up and started walking back to their house.

"Uptight, huh? How can I not be uptight..." Itachi got an idea. "Sasuke!"

"Yes Itachi?" Sasuke said as he turned around.

"How would you like to help me with a prank?" Itachi said, a devious grin on his face.

...

"Fugaku!" Mikoto greeted her husband, who had come home from work, with a strained smile. Fugaku frowned.

"What's wrong, Mikoto?"

"Well...you should see for yourself."

...

"Sasuke, the sky is blue."

"No, Big Brother, it's green."

"It's blue."

"Green!"

"Blue!"

"Green!"

"BLUE!"

"GREEN!"

Itachi and Sasuke's eyes flashed. They both started doing the same hand signs. "Fire Style: Fireball Juts-"

"ENOUGH!" Fugaku, who was watching from the side, yelled. "No fireballs! I don't need two fried kids! To think, you two used to get along so well." He came up to both of them. "Itachi, don't provoke Sasuke, he's your younger brother! And Sasuke, the sky is BLUE!"

"No, Father, it's green!"

"Have you looked up recently?"

"Father, it only LOOKS blue. On the color scale, green comes before blue. The constant flow of chakra to our eyes, combined with the radiation of the sun, makes our eyes observe the scale differently. Hence, the sky is green. People who've survived a Chakra Halt have admitted to seeing a green sky."

"With your reasoning, the grass would be yellow!" Fugaku said.

"No, the grass is green. The sky is only perceived as blue because of the different gases and layers of the atmosphere reacting with both the radiation of the sun and the chakra in our eyes. The grass is solid matter, no different gases or layers to react with. Though, the grass is greener to girls that it is to boys..."

"Then, what about the ocean?" Fugaku asked, slightly desperate.

"The ocean's color is just a reflection of the sky. It actually has no real color. However, Father, if you looked at the sky with your Sharingan active, you should see the sky's real color. You'll see that the sky is green."

"You're wrong and I'll prove it!" Itachi said. He marched outside and activated his Sharingan, then looked up at the sky. His jaw dropped open. "I-It's green," he stammered.

Fugaku looked at him incredulously. "What are you talking about, Itachi?" He activated his Sharingan and stood outside next to Itachi, staring at the sky.

...

The sky was blue. Fugaku could see that clearly with his Sharingan on. He was about to turn and scold the boys, but stopped. Doubts sprung up into his mind.

Sasuke's explanation made a lot of sense, and it had a scientific support. Also, Itachi was a prodigy. The best in generations, in fact. If Itachi saw the sky as green...could that mean that his own Sharingan is faulty?

No. He could not have his own children, let alone the rest of his clan, believe that his Sharingan was less than theirs. He was the CLAN HEAD, for god's sake, and he needed to keep up his authority.

So, he needed to lie. He turned to his children, mouth agape, and said, "The sky is green."

He didn't see both Itachi and Sasuke smirk.

...

Mikoto sighed. Couldn't her stupid husband see that their children were pulling his leg? Now he went and agreed just to assert his dominance.

Oh well. Mikoto decided to play along.

...

"Fugaku said that the sky was green!" one of the Uchiha elders yelled. "He claims that a proper Sharingan can see that!"

"The rest of the clan is agreeing just to not seem like their Sharingans are less than his!" another said.

All the elders started talking at once.

The Head Elder, Sarumi, banged her walking cane on the wooden floors. The rest of the eleven elders quieted and looked at their leader.

"Fugaku has put us in a bad situation. If we do not agree, then we will seem weak. That idiot has left us no choice. We must also declare the absurdity as fact!"

More mayhem erupted among the elders.

...

In the end, the elders also said that the sky was green.

...

"Hiashi!"

"What is it?" Hiashi asked the Hyuuga elder that approached him.

"It is the Uchiha! They said that they can see the true color of the sky with their Sharingan: Green!"

Hiashi stared at him incredulously. "The sky being green? That's absurd!"

"True, but they've belittled the Hyuuga!"

Hiashi raises his eyebrow. "How so?"

"By saying that the Sharingan can see the true color of the sky, they've made it seem like the Byakugan is less than their cursed eyes, for we never saw the sky as green!"

Hiashi's eyes widened. "You're right! Call all available Hyuuga for a meeting! That includes the Branch Family!"

...

"Lord Hiashi, are we really supposed to supposed to say that the sky is...green?" a Hyuuga asked incredulously.

"Are you questioning my judgement?" Hiashi said, glaring at the Hyuuga. The Hyuuga backed down.

"Hiashi," the Head of the Hyuuga Elders said, "the Branch Member has a point." He ignored when said Branch Member winced.

Hiashi faced the Head Elder, Ibori. "If we do not take extreme measures, others may see the Byakugan as lesser than the Sharingan and, by extension, the Hyuuga as weaker than the Uchiha. Is that what you want?"

Ibori glared at Hiashi, but backed down.

...

The very next day, the Hyuuga Clan declared that they, too, saw the sky as green with their Byakugan.

...

Itachi sat next to Shisui who was lying down on the ground.

"I can't believe the whole Clan thinks the sky is green. The Hyuuga piggybacked on, too. Who told your father that saying that was a good idea?"

"Yes, whoever said it must be incredibly-"

"Stupid." Shisui finished for Itachi.

"I meant to say awesome," Itachi said calmly.

"What do you mean by 'awesome'?" Shisui asked incredulously. "People think the sky is green! Who would be so stupid as to tell that to the Clan Head? And then there's your dad! Why would he believe some random Uchiha? He acts like YOU'RE the one who told him!"

Itachi smirked. "I did."

Shisui stared at him, mouth wide open, then smirked, too. "Huh, guess you're not so uptight after all. Great prank."

"It's also a great tactical advantage. It makes the village see the Uchiha as mightier. The Hyuuga just followed along. Other than that, it's perfect."

"Yeah," Shisui said, "until a proper expert comes along and proves that the sky is, in fact, blue. Then, both the Uchiha and Hyuuga's reputations will be ruined."

Itachi's eyes went wide. "****!"

"Don't worry about it, Big Brother, Shisui. I already thought about that." Itachi and Shisui turned and saw Sasuke leaning against a tree, eating a tomato.

"Really? What are you going to do?" Shisui asked. Sasuke shook his head.

"Don't worry about it. Just know that anyone that comes to the Uchiha Clan claiming that we're wrong will be...shut up."

Itachi, pushing aside the ominous feeling he got from Sasuke's words, asked, "What about the Hyuuga Clan? If word gets out from there, it can still hurt us."

"I have an...ally in the Hyuuga Clan. They'll take care of it."

Shisui raised his eyebrow. "And who, exactly, is this ally?"

Sasuke smirked and bit into his tomato. "Don't worry about it."

"You're saying 'don't worry about it' a lot."

"Because you shouldn't. Now, be good little Clan prodigies and go train." Sasuke turned around and walked in the direction of his house, taking another bite out of his tomato.

Shisui turned to Itachi. "No offense, Itachi, but your brother kind of scares me."

Itachi sighed and laid down next to Shisui. "Trust me, I know how you feel."

...

"Did you really-"

"Yes."

"You do realize that-"

"I do."

"They might-"

"I know what I'm doing."

"But still-"

"It'll be fi-"

"STOP INTERRUPTING ME!"

"Hey, keep it quiet!" The two people who were talking blinked and turned to the person who had just yelled at them.
One of the two laughed sheepishly.

"Yeah, sorry about that." They then turned back to each other.

"Fine, I'll be trusting you."

"I knew you would!"

"...why are you so cute?"

"Because the universe said so."

"Hmf."