In the original dub, she calls them a (even more appropriate) "reverse harem"
The maid, describing how Kirimi knows all these terms and ideas.
Maid: She missed her brother, so we read her fairy tales with princely characters in them...but we ran out of those, so we started reading her shoujo manga, and I'm afraid she's gotten addicted.
Later in the manga, we find out that Kirimi has become just like her brother. Barring how adorably silly this is, it also means that all the attempts to make Nekozawa princely were completely pointless.
Don't forget when they crossdress very badly in an attempt to convince Haruhi not to join the Zuka Club. Even the normally deadpan Haruhi was rolling on the floor laughing to the point of crying!
The first episode had one. As Tamaki is talking about what Haruhi should do to draw more attention to "him"self, she's trying to think of a word that describes him perfectly. As he comes over to her, she thinks "I've got it!" and as Tamaki says "Really? I guess my lessons have finally paid off!" right as she holds up a finger and says "Obnoxious!" Cue a stone-white Tamaki and he goes into a Blue with Shock state with a rain of roses whirling around him.
Especially not when he follows it up by retreating into the Fujiokas' closet to mope until he starts growing mushrooms. And then Haruhi scolds him for it.
Especially when he is referred to as 'senpai' and proceeds to shred paper for a hamster. Makes no sense in any context.
Tamaki: "I'm making a hamster home..."
It looks like, from the start, this will be a pretty funny anime. Then you see the very noticeable, blinking arrow pointing at the Renaissance vase. Even THAT is funny, and it's just a background thing.
On the same note, when all of the lights finally turn on and turn into the kanji for 'female'. When Haruhi comes out in the female uniform, cue Tamaki's hilarious reaction.
Again from the first episode. Honey drags Haruhi farther into the room, calling her "Haru-chan" and wanting to play with her. She says "Thanks but I was just looking for a place to study..." and then she registers what he said and roars "WHO ARE YOU CALLING HARU-CHAN?!"
It becomes more hilarious when you realize that THAT'S what pisses her off, but everyone mistaking her for a boy and Tamaki even saying she's openly gay doesn't get so much as an attempt at correction.
From episode 5, the twins having a huge fight which involves throwing stuff like tables and chairs and eventually Honey's stuffed animal Usa-chan. Honey then runs after Usa-chan and gets thrown in too.
That's not even counting when they start throwing things in the refectory, in which Honey yet again becomes a projectile, followed quickly by Mori, and Tamaki, with Haruhi very quietly getting up, grabbing her bento, and deciding that she's gonna eat in her classroom after all.
Just the action of them throwing things at each other is hilarious to anyone who's used to Western Animation.
From the physical exam episode, several come: Tamaki attempting to dress up as Haruhi, Honey and Mori getting recognized in their doctor outfits and immediately going "SHHHH!" to Haruhi when she notices, and the twins stripping off their shirts in front of a crowd of girls, igniting a powder keg of Squeeing.
Tamaki's failed attempt at Genre Savvy-ness in the third episode when he says "this anime is a romantic comedy, which means Haruhi and I are love interests!" was funny enough, but the second he turns around and calls the rest of the Host Club gay side characters was the best part of that episode as far as I'm concerned. The look on Honey's face just makes it better; he's looking down at the line Tamaki draws in confusion, as though he has no idea what Tamaki just said.
There's a more concealed one later on, when Kyoya says that he doesn't believe he's a side character. He doesn't seem to care about the gay comment though.
If I recall the line is "I don't think of myself as just supporting cast, homosexual or otherwise." The fact that his english VA actually is gay makes this one of his funniest scenes period.
The episode where Renge first appears. She does a little rant about how the main cast all look like characters in a game she plays, then points dramatically at Kyouya and yells "You're my real life Ichijo Miyabi!" There's a moment of silence, then this...
(cut to a shot of Mori, who apparently has no idea what an "otaku" is.)
Kaoru: I'VE NEVER SEEN ONE!
Made even funnier in the dub by the fact that Greg Ayres, who plays Kaoru, is a bit of an otaku himself...
Then there's when she first sees a picture of Kyouya. She declares that she's going to marry him, packs her bags while getting changed and then leaves on a plane, all in under 30 seconds (and I don't mean they cut from one of those to the other, I mean in real time.) All the while her father is completely speechless.
Another from the episode with Renge. They're shooting a movie with everyone in the stereotypes she's assigned them. Honey is doing his "bad boy" thing, and then breaks down and runs into Haruhi's lap, wailing "I'm sorry, Haru-chan! I can't do it!"
One from an early episode. After Haruhi explains why her hair is styled like a guy's, she says "I don't really mind looking like a dude, you know?" Tamaki then snaps and screams "A GIRL SHOULD NEVER REFER TO HERSELF AS A DUDE!" He then turns to Kyouya and wails "Mama! Haruhi's using those dirty boy words again!" After he sinks to the floor in tears, Hikaru leans over and whispers "I'm sorry, but who is mama?" Kyouya then wryly replies "Based on club position, I think it's me."
Another from the same episode as above. After Haruhi ticks off Tamaki (again) he grabs a trunk full of stuff and pulls out a large picture of Haruhi dressed like a girl. While telling her to listen to "daddy" (him) he then hauls it over to Haruhi and tells her that "Daddy wants you to go back to the way you were!" Haruhi then explodes herself and screams "DON'T BLOW UP MY PHOTOS WITHOUT ASKING ME FIRST!"
"This is a call for a lost child. This is a call for a lost child." Poor Kyouya.
One from episode 8. After Haruhi and Tamaki fight, there's the part with the crab legs (which involves Tamaki getting hit with the sound effect speech bubble, Tamaki discovering Kyouya and Haruhi in an awkward situation, and when the rest of the cast comes in as Tamaki has Haruhi blindfolded with earplugs so that she doesn't have to hear or see thunder and lightning.
Mori when he's sleepy. Just...Mori when he's sleepy!
From episode 21. Mori's deadpan no-inflection "I'm Frankenstein" followed by Honey jumping at the class rep with a giant pumpkin on his head yelling "I'm the wolfman!" then the subtitle that says "Wrong."
At the begining of the "Twins Fight" episode, Hunny's lampshading of Tamaki's ability to pull a frilly pink dress from nowhere always leaves me rolling:
Tamaki: [holding the dress to Haruhi's back] How about this, my dear?
Hunny: What're you doin' with that dress?
When Tamaki drops a cage onto a boy who wanted to be a host. Haruhi asks where the cage came from.
Honey blowing up a military base after his nap was spoiled.
Tamaki's crazy dream of Haruhi living in poverty.
Kasanoda getting Mistaken for Gay by the school's female population. The girls in the school are all pervs.
My favorite moment is when he looks dramatically at a spot behind Tamaki, which makes Tamaki turn around... only to see there's nothing there. The chairman proceeds to cheerfully greet Haruhi like nothing happened, while Tamaki goes to his Corner of Woe.
Hikaru and Kaoru introducing themselves to Haruhi's dad, while walking all over Tamaki.
And Haruhi's dad seeing Tamaki on top of Haruhi, and walking over smashing Tamaki into the wall without ever loosing his smile.
Mori gives a detailed explanation as to why Honey will lose to his brother, but Honey wins anyway.
"IT'S OKAY, MORI-SEMPAI, I STILL THINK YOU'RE COOL!"
Not to mention his expression afterwards. And Yasuchika accusing his brother of being AN ALIEN.
His evidence? Every day after school Hunny eats 3 cakes. 3, three layer cakes, and he does it all in 3 seconds. Then, he mentions that once in the middle of the night, he saw Hunny surrounded by five of the same kind of cake and he was just eating it all. Then he made a Slasher Smile while telling him he and Usa-chan would like him to join. And Usa-chan moved by himself. And "Chika-chan" ran for the dickens.
Even made funnier when, earlier, The Twins theorized that this was the reason Chika hates Honey, and it was Played for Laughs.
Haruhi's reaction in the last chapter of the manga to the rest of the Host Club showing up at the door of her apartment in Boston.
This troper had to pause the DVD because she was giggling so hard at how Mori just went "Fancy tuna," when they were all trying to convince Haruhi to stay.
The first appearance of the Zuka club. Their last exit is spoiled when they all slip on banana peels. And moments before the episode ends, Tamaki also slips on a banana peel while standing perfectly still.
Haruhi's Fear of Thunder when she tried to casually hide in a wardrobe in episode 8.
Chika's flashback of seeing Honey eating cake in the middle of the night.
Ritsu Kasanoda, feared next-in-line to lead the mafia, saying darkly: "The truth is, I really like kittens, you know..."
Episode 19 (the Zuka Club's revenge) is basically one non-stop string of funny moments. An anime blog this troper read declared it the funniest episode in the show, with the pacing the most perfect.
Matching with the theme of the wealthy and upper-class, the score is littered with classical music. But it plays underneath the crazy antics of the club, and somehow, only enhances the craziness and hilarity, much in the same way the Looney Tunes used to do back in the day. Listen to the OST separately, and proceed to laugh uncontrollably and receive weird looks from your family.
I'd like to nominate the twins frantically convincing Haruhi that Honey is evil— she refuses to believe it until they tell her his blood type is AB.
Hikaru and Kaoru: It's the same blood type as Kyouya!
The Ouran Host Club (sans Haruhi) dressing up as women and the St. Lobelia's girls and Haruhi's reaction to said cross-dressing. Not to mention when Haruhi laughs. See it here.
Tamaki's freaked out reaction to seeing Benio kiss Haruhi's hand in episode 9. As well as his slipping on a banana peel, getting punched by Benio, and upset response to Haruhi telling him she doesn't want to hear about his life.
In chapter 27, (whilst trying to recreate a soup) the Host Club try raw tuna topped with mayonnaise and soy sauce in order to see if it'll tatse like giant tuna. Their reaction?
Kyoya: [on a mobile phone] Yes, it's me. Find the very first person in the world who said that raw tuna topped with mayonnaise and soy sauce will taste like giant tuna... And immediately banish him from the country.
The episode with the Newspaper club. Their president is so sure there's something fishy about the Host Club, and that Tamaki is a mastermind.
In one episode there's a scene where the twins are lying in their (shared) bed in front of their maids. Hikaru pulls off the covers and reveals he's wearing a colorful elephant head on his crotch, that blasts confetti into the air. What really makes the scene is the identical twin maids, who aren't even slightly phased, simply continuing their chorus to declare that breakfast is ready.
In the chapter where Kyouya's managed to find Tamaki's mother, one of the first things that comes out of her mouth is to ask him if he has a kotatsu in his house. Cue big sign of "Deja vu???" appearing above Kyouya. It continues with her asking him about the exact same things Tamaki did when he first met him, all the while keeping a priceless expression on his face as he can't believe how alike they are.
When the Host Club's following Haruhi and Tamaki on their date in chapter 82, Tamaki at one point flirtingly asks Haruhi to feed him, to which the twins get an epic "You have GOT to be kidding me" expression on their faces. It ends with them throwing a shoe at Tamaki's head before Haruhi gets the chance to do what he asked.
To much hilarity in the bonus chapter taking place in Spain to count, though there's one particular Tamaki/Haruhi goodie; they're all deciding what rooms they'll be having at their hotel, and Tamaki insists he and Haruhi'll be sharing a room. When she refuses, he curiosly asks her if she'd dislike rooming with him, to which she starts blushing, saying "I... it's not that I'd dislike it, it's just..." Tamaki then flirtingly asks her "Hmm? Why not?" while giving her a soft stare, causing her to blush madly and run away, stating she has to use the bathroom. The twins meanwhile are whispering to each other how "Pervert milord has resurfaced", the both funny and cute implication being that he had probably wanted to share a bed with her, and Haruhi was worried of how intimate he'd planned to get.
The ending of the manga, where the Host Club finally dresses up Haruhi in girl's clothing during her last day at the club to see if the girls will accept that she was a girl all along, which they seemingly readily do. When Haruhi finally leaves the country, Haruhi's father also talks about her being a girl in front of them...and they react with utter confusion. Turns out they thought Haruhi was a gay crossdresser instead.
Tamaki's mail to Kyouya  and Kyouya's reaction  I dare you not to laugh.
Tamaki: Kyoya, you've really gone too far this time! Look at me, I'm breathing fire! I'm breathing FIRE! It's the fire of my anger I tell you! You've turned the king of the Host Club into a dragon! I AM THE DRAGON KING!
Most of the outtakes are hilarious, but my favorite is from the second episode, with the host hopping girl, from her boyfriend. "It's just a kiss on the cheek, right? you should accept it. It will commemorate you graduation from [host hopping originally] being a total whore." delivered in the same cheery voice to boot.
"What is it now...daddy?" The line is said perfectly, but seconds afterwards J. Michael Tatum cracks up (naturally surprised by the shiptease).
This troper's favorite part was the "really?" at the end of his laughing. It had her rolling on the floor because not even the voice actors could believe this show.
And speaking of Kyoya..."Iiiii hate your face." "Weeeee're out of money." "WE'LL SEE YOU THEN!"
"However, that doesn't mean I'll fall victim to their—ow in the head." It's not the line, it's the deadpan way it's delivered.
From that same episode: "LOOK AT HIS BOTTOM! ...HIS BOTTOM!"
And also: "Don't worry, it's no big deal; it was just a ball flying through a... head and window hitting face... it hurt."
And this: "It's a shame we're just now learning to speak... in English and stuff."
"Takashi...I'm the wolfman!" [wrong]
Then there's a part from the episode where they go to the fake beach. Tamaki slips on a banana peel and Vic starts doing this really weird noise as Tamaki slides across the floor on the peel, rolls for a bit, then slams face-first into a totem pole. This troper was nearly in tears at that part.
Yasuchika. Cockney accent. Aaron must've been waiting forever to have that chance...
You can tell, because you can hear him laughing quietly in between the lines.
Personally, this troper giggles when Aaron's supposed to be reading his lines about Hunny in the Host Club, and instead of hearing Aaron even mess up you hear him laugh and go, "Yessss," because he was THAT excited about getting to rant about cake.
Nekozawa breaking into a Christopher Walken voice in the middle of one of his lines.
I find it hilarious hearing Caitlin Glass whining, "I can't do it! I don't wanna be cute! I wanna be a boy!"
Vic Mignogna using the phrase "all up in here". I wish they had kept that line in the actual dub, because it is priceless.
Tamaki, while holding a hammer: "I've never used a screwdriver before!"
"Mori like sea-shells" while nodding at a mannequin in a bikini. Not to mention the lawls to Vic's "Welcome, poor man, to our world of.....craaaaaap~".
And "Today I'm feeling quite crap!" Wow, Vic sure does love saying "crap"!
Also his mock Engrish after he screws up his L's and R's... "PREEZU BURINGU CARU"
And from a blooper in episode 17: "We're going on...a field trip, yo!"
From the Kasanoda episode:
Haruhi [about a bird Kasanoda just released]: It flew away.
Kasanoda [smiles gently]: Get my gun.
"Hey, you should make the cross-dresser-homo-person do all your s**t. I'm not here to carry teasets, I'm here to learn how to make it with the ladies!"
"Listen up, shorty; you do realize how much taller I am than you? So listen up—beeyotch!"
"But it had nothing to do with...th...that's the line that's written instead of the line I just made up..." "That's no excuse you idiot!"
Tamaki: "Let me just finish crushing this child."
"Your mom here told me to." He was in front of Haruhi's mom's memorial, by the way.
Haruhi: "Today the pink one is...one of em and...I don't know which one the blue one is...I hate them."
From the 5th episode:
Hikaru: "We take our job very seriously boss."
Kaoru: *is making weird hand motion* "Last night we...aaaaaaalohaaa."
Kaoru: "I'm going to write the..ahh I'm gonna keep talking and then... I'm gonna do this next line...... ah f*ck
Haruhi: "Maybe he's right. Maybe I... should learn to read."
From the same episode, "Guys, I'm sorry...that I'm gonna throw up...all over you...BLAUGH! BLAAAAH!" The fact that Kaoru happily shouts "We forgive you! immediately afterward makes it even better.
From the beginning of The Refreshing Battle of Karuizawa!:
Hikaru: "Kaoru, Brazilian wax isn't for women only."
"Could it be...VIC...MIGNOGNA?!"
From the live action version:
Every time Nekozawa appears and every time Tamaki overreacts to things.
Episode 9, in which Hikaru and Haruhi have their little date and the rest of the host club follow them around in disguise... Honey dresses in a pink dress and KYOUYA of all people, wears a panda hat and poses as "her" boyfriend. And the first time we see them in disguise, they're sitting together, Kyouya patting/playing with Honey's hair. It seriously has to be seen to be believed.
As the credits roll in episode 5, after Tamaki and Haruhi have that little heart-to-heart about the thunderstorm, the wardrobe and Haruhi's independence from others even when she needs help the host club start pondering how they never knew Tamaki was into S&M (after finding Tamaki putting ear muffs and a blindfold on Haruhi to help her stay calm through the storm) and proceed to whip out candles, chains, fake cat ears and such, and Hunny even gets a blindfolded Mori on a chain leash and starts riding him around on all fours. (This is somehow funnier due to the fact that in this version Hunny is roughly Haruhi's height and the actors look to be similar ages, instead of being an Adorably Precocious Child.) And the wave of fanfics starts in 3, 2...
This version of Honey jump-hugs people crotch-first. Yes, really.
The episode where the boys try to train Nekozawa to be able to stand the light so he can reconcile with his sister. Kyouya's contribution? Opening and closing a pair of curtains with second-long intervals while Nekozawa Screams Like a Little Girl behind him. It's funnier than it sounds.
When his sister meets the Host Club for the first time, it goes pretty much the same as the anime...except when she points to the twins and asks "Twincest?" the boys are grinning ear to ear and nodding.
In the first episode, when Haruhi bought instant coffee ("commoner's coffee"), Tamaki shouts "I will drink this coffee!", followed by admiring gasps from the surrounding girls.
The first time Tamaki cries out "OKA-SAAN!!" Kyouya points at himself and goes, "You're talking to me?" with such a disbelieving voice, this troper just dies.