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.)
Really, absolutely anything Osaka says or does should be placed here, but for the sake of brevity this troper will only mention her explanation of her contribution to the stuffed animal display ("Hanshin." "Hanshin?") as well as her idea for next year's festival ("There are a lot of dogs and animals inside the cafe...and they're all dead.")
"Don't worry, there aren't any dead cats or anything..."
Tomo calling Sakaki just so she could watch her play with the stuffed cats during the chaos of festival preparation. It's golden in both languages.
Sakaki's response? She draws a background for it. Then Chiyo calls Tomo away, and Sakaki brings a stuffed Chiyo-Dad into the game. The title of that yonkoma in the manga? "The Advent".
Well, she also "contributed" the Nekoko Neko.
Tomo tearfully telling on Yomi because she had a good vacation.
From the same episode, Tomo going postal due to Yomi's string of good luck and rampaging through the cafeteria in an attempt to hit her with a tray, culminating with her getting wailed on by Yukari.
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.
Might as well put a link to the Very Short Movie here, too. Chiyo's test grade is defeated By Your Scores Combined and Osaka breaks Chiyo's pigtails (again).
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.
Osaka in episode 23. BREAD... EATING ... RACE!!!!!
"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.
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.
The numerous times Mr. Kimura pops out of nowhere during the pool episode to deliver lines like these.
mr.Kimura outside the girl's changing rooms(Addressing Yomi, Sakaki, Kaorin and Chihiro): How was it?
and another at the pool...
Nyamo-sensei: Everyone's here right. Now then lets...
Kimura-sensei: Go to the gym and play basketball in those.
Osaka divides her friends into "Americans" and "Japanese" based on breast size. After much reflection, she places Yomi in Hawaii.
Kaorin's Freak Out when she realizes she missed seeing Sakaki on the beach during summer vacation and her Loves Me Not bit. Her expressions are priceless.
How about when Chihiro comes back from the nurse's office and says she can be in the three-legged race if Kaorin wants? She doesn't.
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."
Yomi, Osaka, Chiyo and Tomo participating in the kiba-sen event during the athletics festival. Possibly the worst team ever.
The second beach episode. Nyamo tells the girls to go to bed early, and Tomo's not happy about it, until Yomi tells her going to bed early will make the next day feel longer. Following this exchange, Chiyo is seen nodding off. Tomo is slightly pissed, seeing the little brat getting ahead of her by going to sleep early. Cue Tomo putting a stool next to Chiyo's head, resulting in the sleepy girl to smack her head on it. Hard. Tomo's laugh makes the moment even funnier.
Kagura dealing with the Kamineko in her own way. Namely, grabbing him off her face and chucking him on the ground. The completely deadpan expression on her face is 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. This troper busted up laughing at the sight of two chibis 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.
