Furuichi and the pool incident, which cemented his early status as the crazy strategist. After trying and for once succeeding in looking cool, it seems like he's about to get his ass kicked again. Cue the near-baby-drowning.
Also, Oga tries to explain to Aoi the truth of Baby Beel, only to be sidetracked by the fact that he can't remember Beel's full name. Furuichi is no help, and Beel crawls off crying over the fact that neither one can remember his name. See it here.
Now in animated form. The bishie sparkle and the fact that the seiyuu uses a calmer, bishie-like voice during the sequence makes it all the more hilarious.
During the volleyball match against St. Ishiyama, Tojo and Oga perform one of the most epic things to ever grace such a game — a freakin' overhead kick. Which they then get fouled for.
In the same match Himekawa gets pissed at Oga and Tojo for doing that thing above, because "if you're going to cheat then at least do it right!" Which results in Oga using Beel as a decoy for the volleyball.
Oga boasts about learning new, powerful techniques to Miki. Guess what, they're his usual punches and kicks, but with added ham.
Previously, he and Baby Beel had thrown a tantrum because they wanted to fight someone. Furuichi told him to act his age, which earned him a punch in the face.
Baby Beel singing to try and lighten the mood. After Oga demanded that he do it, utterly straight faced.
In Chapter 100, Zenjuro creates a fully powered Doppelgänger of Baby Beel to train him and Oga. Unfortunately, the clone is too much like Baby Beel and despite being able to throw out a Megaton Punch capable of knocking Oga back, his first instinct is to chase down a rabbit.
Even funnier the second time in the anime. Baby Beel picks him up and throws him at Furuichi's house, while the poor guy is screaming for it not to happen.
Narrator: And, like that, the second son of the Great Demon Lord, Beel-kun, safely conquered the Furuichi house.
Chapter 108: Oga proudly declaring that he will now use his new finishing move... and calmly proceeding to make Baby Beel some milk, which includes waiting for the milk to cool down. The demons are not amused.
Graphiel: Isn't it done? Oga: No, not yet! If you don't get it down to normal body temperature... What'll you do if it burns?!
Also in this chapter a captured Hilda asks Behemoth what he's planning to do with her. He responds, in what is a serious situation, "Well, tits". When telling Hilda that he fired En's wet nurses he tells her that "Right now, the Master is longing for tits". He then asks Hilda that he hopes "You'd become our Master's tits"; to which she drop kicks him in the face with stilettos.
Everything about the second proceedings of Oga's trippy courtroom nightmare in Chapter 124.
Also, Furuichi's thoughts on the fight between Hilda and Futaba, with Baby Beel trying to play peacemaker;
Narrator: At that moment, Furuichi saw... Beel is caught between a jealous wife, and an overbearing mother.
Chapter 146 just keeps getting crazier and crazier, with plenty of slamming against the fourth wall while the characters ask themselves what the hell is going on. Barely anything important manages to happen, but there's comedy gold on every page.
Since they're both babysitting, Aoi invites Oga to go to Ishiyama Land with her. He refuses, Furuichi kicks him in the face, and this happens.
Oga: That hur—No, that didn't hurt at all. Kinda sad, Furuichi. Furuichi: Shut the hell up, and forget about my attack power!
The Rice Boy liveshow kicks off with Beel electrocuting the actors and forcing Oga, Kanzaki, and Aoi to take part, then Tojo puts his mask on backwards and completely butchers his lines, and then it all gets ten times more absurd when Behemoth joins in and turns it into an all out battle.
Chapter 160: The Demon King finally sends a video message. Unfortunately, it doesn't show his face; Oga and Furuichi get a close-up of his crotch for the whole thing instead.
Furuichi's reaction to the story of how Himekawa and Kugayama met.
In order to get the giant Demon's Portrait out, Oga has to break through the basement ceiling and the "Four Martial Masters" of the rich school challenge him. Hilda easily defeats them by herself, without even killing them.
Kugayama: Seriously, what are those guys?! They can't be human! [beat] Tatsuya: A monster married couple. Furuichi: They're demons. Tatsuya: You won't last if you're surprised at every little thing they do. They completely destroyed our school twice. Furuichi: They disintegrated that mansion, too.
Episode 13: Ishiyama High students hate studying 180% — so imagine their shock when they get an ability assessment test. The students are so stupid that even Oga is stunned. "Good Night" Shimokawa couldn't even spell his trademark Catch Phrase, and one student even cheated on filling in his name during the test; and the worst part was that the test was on elementary school subjects. At the same time, Oga was in a pinch during Beel's assessment test and was going to dump him off the smartest guy in the school-meaning the guy who got the highest score on the test. Luckily, he managed to pass that assessment test anyway because it turns out the smartest person at Ishiyama High was Furuichi. In all likelihood the smartest was probably Himekawa, but he cheated on the test by taping money to his paper as a bribe.
When Furuichi and Oga first met, Oga couldn't remember Furuichi's name, so he called him Furuchin instead. Then he changed it to Furuchinkov, and then to Pirozhkiborshch.
Furuichi: Get on your knees and apologise to the Russians!
Chapter 176: Welcome back, amnesiac Hilda!
A disguised Kunieda's reaction to seeing Hilda and Oga shopping together.
"Santa is dead."
Tojo taking his part time job as Mall Santa way too seriously.
The boys are told that the "real" Santa will be showing up after an event.
Kanzaki: Is he strong? Yuka: No, I don't know about his battle ability, but... is that important? Himekawa: Of course it is! Kanzaki: We're gonna take presents from him! Know thine enemy and know thine self, and win a hundred battles in a row! Nene: So you're going to take them by force? Chiaki: That's just highway robbery.
Kanzaki and Yuka's tactics during the three-legged race, and later the Indirect Kiss contest.
Azusa is given 'squirrel' as her topic for charades, while Nene is given 'poop'. While Nene agonises over how to demonstrate this for Furuichi, Azusa just blurts out the answer to Kazuya and gets them disqualified.
When they're pitted against each other, Saotome reveals to Oga that he once groped Hilda's breasts.
Saotome: Really, they were amazing... world-changing. Oga: You're gonna get killed.
Baby Beel vs Dark Baby Beel, only for Beel to get smacked into Hilda. Goodbye, amnesiac Hilda.
Oga and Saotome engaging in a Pummel Duel just like the Baby Beels while Hilda and Ikaruga resort to insults.
Hilda: Idiot. Ikaruga: Moron. Hilda: Die. Ikaruga: Hah, you die.
Don't forget the part where Ikaruga announces, to everyone watching, that she's Saotome's wife.
Yuka and Nene are in a cooking competition (alongside Kanzaki and Furuichi, respectively). Kunieda is horrified. "The world is going to end."
And later Himekawa demonstrates just how easy Oga is to fool by tricking him out of a Big Damn Heroes moment.
Himekawa: [to Oga, surrounded by Takamiya's gang] You moron. I didn't betray you. I only did all this so I could get good intel on these guys, so stay out of my way. Oga: Huh? You serious? W-well sorry about that. Let me get out of your way... [and he leaves] Himekawa: So, as you can see, he's a total fool.
By Chapter 217, it turns out Himekawa was telling the truth to Oga making it even funnier.
The gang searching for the pieces of Furuichi's soul. Special points going to Tojo.
A member of the Solomon Company reveals her demon, Cancer, a giant crab. Cue Beel and Oga's very enthusiastic shellfish hunt.
To track the Solomon Company, Oga, Beel, Furuichi, and Hilda go to America. And it turns out Oga and Furuichi really don't speak English. Furuichi can manage some Engrish, but Oga's complete failure at the language results in him getting called "Mr. Fuck".
Also Hilda riding on top of the semi truck, cool as a cucumber.
Chapter 232. After explaining their evil plan the Solomon Company start to pat themselves on the back....unitl Johann reveals that Iris took Beel back thus ruining their plans leading to them freaking out