First impressions and HOW! Anya, the exchange russian girl, exploded at Heechul when he called her "puddle" because of her hair.
Anya: You called me A DOG?!
Explorers of the Human Body
After Kibum succesfully cries on cue, they decide to see if a sad song can effect, so they try it on Yesung. Yesung tries to build up to this by calling for his mom, promising to be a good son... only for nothing to happen at all.
Shin Dong Yup: Tell me the truth... Were you really thinking of your mother?
Yesung: (Beat) When the song got into the "Black bean noodles" I suddenly remembered I was hungry...
[Dong Yup then sends him back to his seat with a Dope Slap]
Then they decide to use the help of an actress, so they can produce tears via drama. The results are:
Donghae's situation being his girlfriend gradually losing her memories of him. Suddenly he ends up going out of script by replying "Why did you eat the eraser?!"
The others start sabotaging Eunhyuk's turn with Kangin, out of nowhere, knocking him off with a monocycle and the others hijacking the scene.
Everyone joking how Leeteuk is so old that he could be the lost member of H.O.T. (from the 90s)
The dodgeball competition.
Kangin: (to Siwon) If you have another chance to throw and you don't, then you're dead.
Kangin: (to Yesung, after dancing with Junsu) If you do that once more, you're dead.
Yesung's ego started to rise since his 89 cms. vertical jump, so everytime the others jumped with a lower score, Yesung went jumping everywhere. That until Sungmin discovered the belt was supposed to go under the shirt. They tested it with Yesung again and everyone started to laugh at him.
When it was Yoochun's turn and they had the same record, Yesung started to hug him and call him "brother".
In the balance episode, the members each had to strap themselves to a machine that spun them around before walking along a platform to do a heart pose (It Makes Sense in Context). The results were funny in themselves, particularly in the cases of Donghae (who got encouragement from a very pretty ballerina but still couldn't finish it properly) and Hankyung (who had formal ballet training and was therefore flawless), but Leeteuk takes the cake. He declared that he would carry out the challenge in the style of Sailor Moon's transformation, requesting that the crew add effects and background music in post-production. And they did.
Intimate Note Ep. 25 and 26
Episode 25 showcases Kangin and Sungmin being awkward to each other. Once they're on set, one of the group dynamics include holding hands, say one thing they like from the other and kiss each other's hands. Said dynamic is demonstrated by Hankyung and Heechul, who did everything with straight faces, unlike Kangin and Sungmin.
The other activity was "Drinking a Coca Cola from the same bottle with straws". The result? Kangin kept doing Spit Takes to Sungmin's face because of the laughter.
Episode 26 reveals the other targets were Heechul and Eunhyuk. Hilarity Ensues in massive ammounts:
All the others take oportunity to scream from a balcony things they didn't like about the duo. Each individual reaction is worth mentioning:
Ryeowook complaints how Eunhyuk rarely invites him to eatnote In Korea is custom to invite the younger members a meal. Followed immediately by an "I love you". Kangin also makes him call Eunhyuk "bastard".
Leeteuk calls Eunhyuk a disloyal guy who could betray him any time (all this is joke, of course). Then complains about Heechul not deciding which female idol he likes more and to just decide for one. Followed immediately by an apology and "I love you".
Then Kyuhyun's turn. He starts by stating he is not going to usekorean honorifics. He then complaints that Heechul favors more Hongki than him, being the maknae, and how Heechul never reacts to his jokes, to which Heechul starts yelling at him that "he is a brat and Hongki wouldn't drag him to a Reality TV show". And then praises Eunhyuk for being a Smug Snake (the same thing Leeteuk yelled at him minutes ago).
Then everyone start cheering "We love you Milk-Skin Kim Heechul".
Then it came the "VS Dynamic", where each pair would pass a microphone and counter with things they never told to each other before.
Eunhyuk vs. Heechul: Eunhyuk complaints are about Heechul spending more time on his blog instead of practicing his singing and his weird microphone hold. Heechul countered with Eunhyuk always looking like the inocent one in arguments (the others then conclude Heechul is in Never My Fault mode) and then he proceeds to expose his (and the others' on the way on) shoe lifts.
When the others are tasked to vote for the loser (meaning they had to stand behind the meanest), Eunhyuk was chosen. Why? Because previously, Heechul warned them how living with him was just begining. The only ones who still chose him were Hankyung and Sungmin.
Kangin: Hankyung asked where to stand, and I said wherever you want. And then asked "Do we stand behind our friend?"
Kanging vs. Sungmin: Sungmin complained about Kangin having favoritisms among the younger members, him not taking practices seriously and getting fat.Kangin's points were about Sungmin being a Deliberately Cute Child, suspecting Sungmin for being the one who leaked the MV and to ask directly if he wants something instead of sending indirects.
Kangin lost the match by admitting defeat and asked Sungmin for his gym's address.
Heechul and Eunhyuk get dressed in QiPaos. Eunhyuk goes by "Miss Shanghai", while Heechul becomes Heesica, who said to everyone "Babo/Dummie". Everyone's jaws dropped to the floor. This also gets lampshaded:
Their covers of Gee, highlighted by Heechul's perfect Jessica impersonation.
Followed by a very over-the-top Sorry Sorry dance in their outfits (also aided by Kyuhyun, Ryeowook and Hankyung for the choreography. Ryeowook tried to do all this straight, Hankyung left at the second half of the song and Kyuhyun was visibly Corpsing), with Heechul Chewing the Scenery.
Last activity of the day was writing anonymus friendship-messages for the four members. While it's blatantly obvious who wrote each message (for instance Hankyung's inintelligible korean handwriting), it was even more blunt with Kyuhyun, since not only all the notes started with "I'm not using honorifics", but also was an almost copy-paste for each one: "The anonymity is the charm of this, I like your smugness. You ate dinner with [Insert Name here], and I got jealous because you're mine. Let's play Starcraft". Everyone just Dope Slapped him while he kept claiming he didn't write it. Also this quote:
Sungmin: (Reading the note for Kangin) "Also you ate with Sungmin-ah, right? You two looked very close, and that upsets me because you're only mine" (Beat) You Bastard!! What's this?!
Kyuhyun: Yours is the real one!
After they did the Gee cover, Heechul also wanted to do this for Fx's "Chu" and he wanted to be Krystal, since she's Jessica's sister. Then Sully called and mentioned "It would be very funny if you dressed as me, oppa", so Heechul had to agree and look for other members to fill the role.
It's also speculated that Hankyung would have been Victoria if he didn't leave the group, so Shindong filled the position.
The DJs (Leeteuk and Eunhyuk in the past, then Ryeowook and Sungmin before Sungmin's departure from the program) are often caught on camera doing all sorts of stupid things on board, such as dancing to the songs they play and falling over themselves when they laugh.
Ryeowook just realizing for the first time that "shit" is a bad word... after singing soulfully to "Moves Like Jagger" in one of their concerts. It is beyond adorable.