Or the Relax-o-Vision''music'' which plays over the explanations, even when Chiyo-chan recounts them to a now-sober Nyamo to understand what she was talking about? (Chiyo's eleven, for you non-anime people.)
Sakaki reunites with Mayaa, who is residing at Chiyo's house. Mayaa hops into her arms. The funny part comes when Mr. Tadakichi tries to do the same to Chiyo. Chiyo is a small child and Mr. Tadakichi is a large dog. The result is predictable:
In the manga, Tomo studied extra hard for a P.E. test in order to compete with Chiyo. She aces it, beating Chiyo by a few points. Next strip, Yukari passes back English tests. After Tomo says she got a 35, Chiyo turns around and gives her an extremely smug look.
A scene from the manga which didn't make it into the anime: Tomo sees a freshly-painted wall and instinctively slaps her hand onto it. The look on her face is priceless as she realizes that, yes, doing that gets paint all over your hand.
After half an episode of abusing Yomi, Tomo tries to hit her with a lunch tray and ends up hitting Yukari in the face with it. The twenty second still shot of their faces (Yukari's glowing red eyes and Tomo's smile) is hilarious.
Followed by Yukari Dual Wielding twin lunchtrays and smiting the tar out of Tomo.
"I came in last." *nom* "It's melon bread." *nom* "Ah! ^_^"
In the same episode, Yukari's ridiculously circuitous metaphor for why she won't bet this year with Nyamo. She calls Osaka up to represent a currency amount and after declaring "I win Osaka!" says that soon Osaka will be leaving her. The Fridge Brilliance comes in when you realize that while it would have made a lot more sense for Yukari to just hold up a bill, she's so poor that she likely didn't have that much money.
But of course, she doesn't just say "10,000 yen," she says "Mr. Yukichi" ("Yukichi-san", really), referring to the man on the 10,000. (Which would be sort of like saying "You'll be Benjamin Franklin.")
It's also a brilliant Call Back to last scene of the first Sports Fest when she won 10,000 yen from Nyamo, but she owed her that much so "Bai Bai".
Kagura at the train station, trying to offer to help a guy with his luggage. A guy who doesn't speak a word of Japanese. "HERUP ME!" and "YAY! *thumbs up*"
Then Yukari tries to show her how its done by walking up to a random tourist. After some excited jabbering in the background, she runs away with a cry of "It's no good, he's German!"
After learning that Chiyo was planning on studying in America, Osaka has an Imagine Spot where she travels to America and is greeted by a bunch of chibi-Chiyo clones, which act quite a bit like Pikmin.
During one of the "sports competition" episodes, there is a sort of scavenger hunt/race where Chiyo has to bring something stupid back with her. After hesitating between Osaka and Tomo, Tomo speaks up and asks what has to be done, and suggests taking off her clothes. Chiyo then tearfully chooses Tomo.
The first sports fest episode has another Osaka one. Her relay race involves bringing back a pair of glasses. She borrows Yomi's and then puts them on, leading to her running more ineffectually than usual.
Kagura proclaiming Santa to have "awesome lock-picking skills" and Tomo tearfully insisting that she's not stupid after learning that reindeer aren't mythical creatures, both from the Christmas Episode.
Heck, Kagura and Tomo's discussion about Santa Claus in general. "I don't think he came from space."
Chiyo's reactions later are even better. First, her terrified flashback. Then, next year she arranges for a car large enough to carry the whole group and once. Yukari moves up next to the driver's seat and Chiyo pushes her out of the way. In the third year, there are too many people for that, so when the Yukarimobile is revealed she vanishes into Nyamo's car before the discussion of who goes in which car even starts.
Yukari-sensei visiting Nyamo-sensei just to sleep. Bonus points for Yukari telling her to get out of her house after hearing how much Nyamo's new pillow cost.
Later on in that same episode, Nyamo recieves a gift from her uncle in Hokkaido. Cue Yukari running to the mailman, snatching the package from his hands, and tearing it open like mad, believing it to be delicious and expensive food. It's actually a hand-carved wooden statue representing a bear. Yukari gets pissed and actually tries to call Nyamo's uncle to tell him to send food next time. Predictably, they end up bickering, and completely forget about the mailman, who was still waiting for a signature. Seeing Nyamo and Yukari pinching and pulling each other's cheeks is both adorable and hilarious.
Kimura: "But, Kaorin and I will be together forever" *heart and cracks neck* Kaorin: *goes white with shock* See it here.
Kaorin trying to find Kimura's "good points" and finding out that he likes gardening only to find that he made a Kaorin/Kimura garden. "Good points...good points...LIKE HELL I'M GONNA FIND ANY!"
In the episode where Kagura is introduced (ep. 10), she & Tomo start doing Volleying Insults, and soon degenerate into face-pulling and grappling with funny little sound effects coming from them throughout.
In the first English translation of the manga, the way that the Blue Three conversation is translated is pretty hysterical:
Osaka: If there's a damn van... is there a damn CAR? ...that must be Jackie Chan's codename.
The jist of the conversation is this: The girls mistake Jean-Claude Van Damme's name as Damn Van (his first name's a swear, cause he's a foreigner), leading them to wonder if Damn Car exists as well.
Yukari and Nyamo's arguments in general are both cute and hilarious, with Yukari never missing an opportunity to pick on her friend about how she used to be or what she used to do in high school.
In episode 7 : The girls' class mascot is a huge cat. At one point, Chiyo asks Sakaki to take a picture of her with that mascot, and in turn, Sakaki asks Chiyo to do the same. After both pictures are taken, Chiyo wonders who is in the cat costume right now. That person removes the costume's head, and surprise, surprise : It's Kimura-sensei ! Needless to say, both girls were shocked.
Speaking of which, Sakaki's look on her face as Yukari suggests burning the leftover stuffed animals "for a memorial service" is hilarious.