History Recap / ArthurS2E14SueEllensLostDiaryArthursKnee

* DontTellMama: D.W. threatens to tell on Arthur going to the dump. He threatens to tattle on her for tattling, and she threatens to do the same. In the end, he says that she can come, but don't tell anyone. She convinces him later to confess to their mother about what happened because if the cut gets worse, he could get seriously ill.
* ExactWords: Nadine told D.W. that she promised not to tell. But she can still convince Arthur to tell on himself so that he can get the help that he needs. Arthur is convinced when Brain tells him that he could get badly ill.

* JerkWithAHeartOfGold: But D.W. was still worried for Arthur injuries.
* JerkassHasAPoint: When D.W. cries about how she'll be stuck doing Arthur's chores if he gets sick, the Brain concedes that her assumption Arthur could potentially get sick from his cut knee could potentially render him sick from any myriad of diseases.

* AnAesop: There are just some problems too big not to come to an adult for.

* HeelRealization: When someone informs Francine that Sue Ellen's diary could read that she's a bully for pushing her in the mud (which ambiguously she defends that she fell in on her own), it leads Francine to reflect that if she keeps it up with her [[JerkWithAHeartOfGold bully-some]] attitude, it might lead others to think of her as an ''[[JerkWithAHeartOfJerk actual]]'' [[{{Jerkass}} bully]].
* HerCodeNameWasMarySue: Muffy's reimagining of Sue Ellen writing a story about her has her as a brave, smart princess that always has perfect hair and can take down a dragon with perfume. Binky snaps her out of it when she's blocking a bookshelf.
* ImagineSpot: At learning Sue-Ellen is missing her diary, Francine wonders if it will contain stories of how she's nothing but a bully to her. This leads her to imagine her bullying sends Sue-Ellen to therapy, where Francine's "ogre-ism" is identified as a [[SeriousBusiness serious]] reason to quarantine and isolate Francine herself from other children.
* AMindIsATerribleThingToRead: The ColdOpen has Arthur explore the concept of reading other people's minds, and it's not as fun as he imagined it would be. For starters, D.W. is thinking of dressing up a shrunken version of her brother in dolls clothes, which makes Arthur shudder. He's disappointed that all Pal can think about is food. And his parents are pretty transparent that they just want him to go to bed when he tries to read their minds. All in all, Arthur decides reading people's minds isn't all its cracked up to be. This is meant to frame how reading a stranger's diary is just like reading their minds.
** Building on that, Sue-Ellen's diary is indeed played up as a realistic form of reading somebody's mind. Upon finding her diary, Arthur and his friends are hesitant to read it, as it could contain something uncomfortable (like Binky's fears that [[GirlsHaveCooties she has a crush on him]]) or that she doesn't think highly of them (like Francine's fears that Sue-Ellen thinks she's nothing but a bully).
* MythologyGag: In one of the picture books, Arthur mistakenly thought Sue Ellen was a secret admirer of his. She teases that she thinks he's a nice guy.

* LickingFoodOffTheFloor: Pal licks the ice cream dripping from D.W's cone on the floor.

* AdultFear: The whole premise really. Arthur sneaks off to a forbidden area in the dump, and we see ''why'' it's forbidden.
** Just as Arthur finds a workable bike wheel and nearly makes it out intact, he cuts his knee on a lima bean can and drops the wheel. D.W. has to help him up so he doesn't lose his grip and fall.
** The cut by itself is really deep, and Arthur is moaning in pain as he limps with it. D.W. is already terrified of seeing her big brother hurt, and asks Brain to help when he comes to work on the project. While he is no doctor, Brain says that the problem is that, unlike with a papercut you'd get at home, the dump is festering with different unknown germs, and they have a one-way ticket inside with the giant gash on Arthur's knee.

* HeelRealization: When someone informs Francine that Sue Ellen's diary could read that she's a bully for pushing her in the mud (which ambiguously she defends that she fell in on her own), it leads Francine to reflect that if she keeps it up with her [[JerkWithAHeartOfGold bully-some]] attitude, it might lead others to think of her as an ''[[{{Jerkass}} actual]]'' [[{{Jerkass}} bully]].

* ImagineSpot: At learning Sue-Ellen is missing her diary, Francine wonders if it will contain stories of how she's nothing but a bully to her. This leads her to imagine her bullying sends Sue-Ellen to therapy, where Francine's "bully-itus" is identified as a [[SeriousBusiness serious]] reason to quarantine and isolate Francine herself from other children.

* ImagineSpot: At learning Sue-Ellen is missing her diary, Francine wonders if it will contain stories of how she's nothing but a bully to her. This leads her to imagine her bullying sends Sue-Ellen to therapy, where Francine's "bully-itus" is seen as a means to quarantine and isolate Francine herself from other children.
* AMindIsATerribleThingToRead: The ColdOpen has Arthur explore the concept of reading other people's minds, and it's not as fun as he imagined it would be. For starters, D.W. is thinking of dressing up a shrunken version of her brother in dolls clothes, which makes Arthur shudder. He's disappointed that all Pal can think about is food. And his parents are pretty transparent that they just want him to go to bed when he tries to read their minds. All in all, Arthur decides reading people's minds isn't all its cracked up to be.
** Sue-Ellen's diary is played up as a realistic form of reading somebody's mind. However, everyone is hesitant to read it as it could contain something uncomfortable (like Binky's fears that [[GirlsHaveCooties she has a crush on him]]) or that she doesn't think highly of them (like Francine's fears that Sue-Ellen thinks she's nothing but a bully).

* AmbiguouslyGay: Muffy briefly considers that maybe Sue Ellen's story that is private is about ''her''. She looks enamored of the idea, of Sue Ellen being her lady-in-waiting and doting on her.
* BeCarefulWhatYouWishFor: The ColdOpen talks about this. Arthur develops telepathy and starts reading minds around the time. He finds out that D.W. is dreaming about dressing up a doll-sized version of her brother, Pal is dreaming of food, while David and Jane clearly want Arthur to go to bed. As he mentions, you don't always want to know what people are thinking about because the answer may disappoint you.