It had started out a reasonably normal day. Sure, the boy known as Conan Edogawa was actually the shrunken form of the high school detective Kudo Shinichi, had an odd habit of finding murders literally every time he wanted to go go somewhere, and was currently in the process of trying to figure out who Rum, the second in command of a dangerous organization was, but still, for him the day was relatively normal. Kobayahi-sensei was out for the day sick, and Wakita-sensei had been on vacation for a while, so the students were just waiting for their substitute to come in.

First grade kids filled the classroom around him, talking and tempted to play around without an adult in the room, until the door slid open. A man in a suit with a nice smile on his face walked in. He introduced himself as Kamijou-sensei with a pleasant and comforting voice that didn't quite reach his all the way to his eyes. This immediately sent Conan and Haibara on guard, they got a distinct impression that there was something fake about the man. He walked over and smiled, introducing himself to the class as their substitute for the day, and setting some ground rules. First, there was to be no one getting out of their seats without teacher permission. Second, he didn't want to hear any Japanese unless he called on someone to speak. And third, they had to all try their best. He made it very clear that he would not politely tolerate any misbehavior.

Everything went fine that day until the last twenty minutes of class. The detective boys wanted to talk to Conan about a haunted house they found, so they started sneaking over to his and Haibara's desks while the Kamijou-sensei's back was turned. On the way Ayumi found the teacher's eraser, which he must have dropped while he went around grading papers. But, when she went to give Kamijou-sensei has eraser, the teacher suddenly turned around and hit her.

"What are you doing! I told you all to not to get out of your seats!" He yelled and pushed Ayumi back into her seat. Conan felt the world go red as his genius brain started sifting through different retaliations if the situation turned bad, different ways to stop Kamijou-sensei through all of the different weaknesses Conan had observed and kept track of throughout the day. He is impatient. He does not like to be proven wrong. He is quick to give up if he begins to lose. He dislikes people more intellegent than him. Nothing seemed to be a specific weakness he could use in a moment, more a gradual build up.

"Ayumi!" He cried, getting out of his seat and running over to the girl with the other detective boys. He turned to glare at the current substitute. "Nani shite iru no!" (What the hell are you doing)

"Nope." Was all the teacher responded with, pointing to rule two that he had written on the blackboard.

'Fine.' Conan thought in his head, 'if that's how you want to do this.' "What the hell do you think you are doing?" He said switching to English and catching the teacher off guard.

"Uh, no English either." The teacher quickly caught himself.

"Nǐ dàodǐ zài zuò shénme." He asked again in Mandarin.

"No uh, Manarin either." Kamijou-sensei responded having a little bit of knowledge in a wide variety of languages.

Switching to Korean, Conan responded with, "Dangsin-eun mwo haeyo."

"No Korean either." He continued, thinking there couldn't be that many languages a six year old would know.

"Hvad fanden laver du."

"No Danish."

"Mea o ka malu o ka poe i oe e hana."

"No Hawaiian."

"Was zur Hölle machst du."

"No Germa-never mind. I don't want to hear any talking unless I give you permission form now on."

Conan sat back at his desk and started tapping, adding in a few full hand slaps. It took the teacher a few seconds of staring at Conan in confusion to realize that he was tapping out morse code in defiance.

"No, just no more sound. I don't want to hear any noise from any of you unless I give permission. Flip open your books to page fifty-six and read to page sixty-three." Content that he had solved the problem, Kamijou-sensei started grading papers that were given out earlier that day. He also noticed with annoyance that the Conan had gotten 100% on his even though it hadn't looked like he had put much effort into it. After a several papers were graded he glanced up at the class, only to see Conan holding his hand up without doing any of the required reading.

"What!?" was all Kamijou-sensei could muster out in his exasperation. The rest of the class stopped their required reading to watch the growing tension between student and teacher. Conan, not offering any verbal response, brought out his hands and started talking to him in sign language.

"Class dismissed." was all Kamijou-sensei said as he stood up from his chair and walked out of the classroom-vowing to never try to substitute at this school again.