* The episode "Hey Harold!", featuring quite possibly one of the most touching and adorable pairings in the history of animation, Harold and Patty.
** Any episode starring Big Patty, really; how Arnold manages to convince her to fake a beatdown on Helga and they share a bit of heart to heart, how Harold stands up to [[ThoseTwoGuys Stinky and Sid]] when they mock Patty (twice; first time after a dance together, second time after losing an arm-wrestling match to her with pride and dignity) and even ''[[SpoiledSweet Rhonda]]'' who gave another snobby materialistic girl a verbal beatdown before things escalated into a repeat of the reform school they both went to, or worse. By the end of each episode, they all gain a bit of respect towards Patty and find that she isn't so bad as they first thought after all.
* When Mr Hyunh finally reunites with his daughter in "Arnold's Christmas"
** How about Helga sacrificing her own gift (the Nancy Spumoni signature boots that were considered a hot Christmas item) in order to make it happen without any recognition and without any sort of notice. And keep in mind that this was from her parents who seem to have a WellDoneSonGuy relationship with her. So for her to sacrifice that rare bit of recognition and love from them in order for Arnold to make Mr. Hyunh's wish come true is just...it's a mix of a CrowningMomentOfHeartwarming and a TearJerker. [[WhatYouAreInTheDark And no one will ever know]].
* The end of "The List," where Grandma finally finds a place for her piano, on the roof, after spending all day trying to get in in the house, and sings a song to Arnold, who's had a long string of bad luck, about not letting the misfortunes of life get you down.
* The end of "Sally's Comet," when their plan to work get everyone to turn out their lights works so they can see the comet in all its glory, just like Phil did with ''his'' dad seventy years ago.
--> Grandpa Phil/(Flashback)Phil's Dad: "Twenty Three Skidoo! Boys, you're going to remember this for the rest of your lives!"
** Also:
---> Arnold: "So, what do you think we'll be doing in seventy years?"
---> Gerald: "Lookin' at this comet again!"
---> Phil: "Yes sir! Course, I won't be. I'll be... y'know."
---> Gerald: "Man, no ya won't, Phil."
---> Phil: "Will you stop calling me 'Phil?'"
* The end of "The Beeper Queen". Miriam's finally taken some initiative and has proven she's more than a "smoothie"-guzzling scatterbrain by taking over for Bob at the beeper emporium, and she ''loves'' it. But once she [[MyGodWhatHaveIDone realizes she's neglected Helga]], she gives it all up to come back home, and she and Helga even hug. This being the [[DysfunctionJunction Pataki]] family makes it all that more meaningful.
** Also, any time Big Bob shows some HiddenDepths and love toward Helga.
* The ending of "Crabby Author". "Even if you're afraid to go looking for magic, magic still may come looking for you. The end."
* The Veteran's Day episode that ended with Gerald's dad re-meeting the man (and meeting the family of) whose life he saved in Vietnam.
* Also the ending to "Phoebe Skips". It shows how Helga and Phoebe`s friendship means to each other.
---> Helga: "You're more than just my sidekick. You're my best friend."
* In "Helga on the Couch," the {{Flashback}} to how Helga and Arnold first met surely qualifies.
** And is preceded by a Crowning Moment of Heart''breaking'' in the previous scene, where Helga is announcing that she's going to preschool, only to be completely ignored by her parents.
* "Field Trip", where Arnold and his grandma team up to free an old, ill-treated turtle from the aquarium. The episode ends with them watching him swim away to the sea, as the sun rises.
* Chocolate Boy [[DoesThisRemindYouOfAnything finally being free of chocolate]] provoked an IRL "awww" from me. Especially when he's seen all [[GRatedDrug clean]] at the end of the episode. Awwww.
** And it sticks, too, flying right in the face of StatusQuoIsGod. He's now addicted to radishes. ...Well, at least they're healthy.
* Arnold [[ShipTease hugging]] Helga at the end of "Arnold Visits Arnie".
* Four words: "You keep the money."
* This troper hasn't seen the episode in years, but one moment rings in memory: Helga's father gets tickets for a function she wanted to go to, thinking it was a musical. In reality, it was a wrestling match. Despite the mixup Helga and her dad enjoy the show together.
** What's funny and heartwarming is that they bond by [[SoBadItsGood mocking the musical.]]
* In the ThanksgivingEpisode, Helga returns home - expecting her family not to have missed her. Instead, she sees Miriam demanding the police find her missing daughter, Big Bob about to get in his Hummer to patrol the city and Olga having just finished dozens of fliers she intends to hang up. Naturally, they're overjoyed to see her safe and sound, and all admit out loud that they love her.
** Meanwhile, at the boarding house, Arnold returns home to gladly celebrate their tradition of Fourth of July (as Pookie flips the holidays every year). However, his grandparents and the borders have set-up a bonafide Thanksgiving dinner for him on the roof.
--->'''Arnold:''' Thanks a lot. Do you think we could still have fireworks?\\
'''Pookie:''' [[CrazyAwesome Oh, Arnold, it wouldn't be Thanksgiving without fireworks.]]
* In "Best Man," Coach Wittenburg asks Arnold to be just that at his wedding - saying he's his only true friend.
** Also, him sacrificing the win for his wife - again.
* There was an episode where the kids try to take the subway but it ends up malfunctioning leaving them along with a hobo, a blind man with his dog, a psychologist and his patient trying to overcome claustrophobia, a retired nurse, and an old man stuck underground. Of course tensions run high but near the end, Arnold notices there's something wrong with the blind man's dog and points it out. The retired nurse joins Arnold while the blind man sits back and worries. Some moments later he asks if his dog is alright, Arnold reassures him and tells him his dog was actually female and then moves out of the way to reveal puppies! The blind man just starts crying tears of happiness and says "I'm going to be a daddy?!" And to make it even better, the subway turns back on (thanks to Grandma) and everyone cheers!
* In "Casa Paradiso", where Grandpa tries to sell the boarding house and tries to make Arnold, who refuses to leave, come with him to live in a condo. The heartwarming part comes in as the residents stand by Arnold's protesting of selling their home, and they swear that they'll take care of him.
* Arnold singing to an ill Glueboy the mule in "The Racing Mule".
* Helga admitting her feelings for Arnold to Lila in "School Play", and Lila stepping down from the Juliet role to give Helga the chance to kiss Arnold, saying she finds her feelings "ever so sweet". [[RomanticPlotTumor A shame the show couldn't have just left it at that.]]
* "Phoebe Breaks A Leg" is a true friendship episode for Helga and Phoebe. After Phoebe gets hit by a bus running errands for Helga, Helga is immediately, [[MyGodWhatHaveIDone deeply contrite and vows to be a better friend to Phoebe]]. She cleans Phoebe's locker, brings her stuff to wash her hair, gets her lunch for her, etc. Phoebe begins taking advantage of Helga after Helga was treating her like staff, but then when Arnold gives her a subtle WhatTheHellHero and Helga almost gets hit by a bus, Phoebe ''pushes her out of the way''. The two then honestly talk about their feelings when Phoebe visits Helga in hospital. It goes to show that, inconsiderate she may be, Helga truly does have a HiddenHeartOfGold and Phoebe knows this, which is why she's such a loyal friend. Aw.
----