Louise crying because Bob and Gene won't hang out with her anymore. Made even more heartwarming because of her usualpersonality.
Also Bob and Gene's interaction in this episode, bonding over a series of films.
Gene and Louise getting back at Tammy, the girl who was blackmailing Tina doubles as this and Crowning Moment of Funny. Includes this memorable line from Gene, who sums up exactly what fans and critics love about this show:
Gene: We're Belchers, from the womb to the tomb!
Any time Bob does something crazy for his children's sake (and for his wife, as seen is the dinner theater episode). It happens a LOT for Tina in the first half of Season 1. Fighting Jairo? Check. Shaving off his mustache for her? Check. Bob may think his family is crazy (and they are), but he'll do anything for them, and it's both hilarious and sweet. Tina put it well.
Tina: Jimmy Junior won't make this party perfect. You will, dad.
There's something sweet about Gene's reasoning for why he couldn't remember the name of the restaurant when given the opportunity to do free advertising. As he describes it: "You're my dad, I think of it as Dad's Burgers." That's... actually really sincere for a child Gene's age.
In the 3rd season Christmas Episode, when the kids willingly give up the hard-earned money earmarked for their presents to buy the mannequin from the sex shop owner for their deranged house guest, who is in love with it. This show makes that heartwarming.
"Lindapendent Woman": Linda gets a new job at a supermarket. Not only is Bob miserable without her, but between that and the fact that the restaurant's finances collapse without her to sort out the bills, he still gets over his initial bitterness and tells her that if the new job makes her happier he's fine with her keeping it.
Gene's friendship with the high tech toilet from "OT, the Outside Toilet".
"Bob Fires the Kids". Not sure what's better, that Bob fires them because he's afraid their childhood working will be as bad as his was, or that the kids are genuinely disgruntled at not being allowed to hang around the restaurant all day.
After Tina meets Josh from the supermarket, it almost seems like they'll never see each other again...until she comes across him walking home. It's nice to see a person who doesn't alienate Tina and Josh is genuinely interested in her.
"Carpe Museum," when Louise is snarking with Bob and alludes to herself one day running the restaurant. Bob lights right up realizing that Louise, on some level, actually looks up to him, and Louise's embarrassed denial is just plain cute.
Louise hugging her father at the very end (along with Rudy) adds to the sweetness.
Bob: Hey, I'm glad we ditched. That was fun.
Louise: Me, too. Let's do it again sometime. Like, maybe when you're old and senile, I'll close the restaurant and come spring you out from the nursing home.
Louise: Sorry, I didn't want to do it, but Gene and Tina put you in a nursing home. And not one of the nice ones either.
Bob: No, you said you'd be running the restaurant.
Louise: Oh, no, I was just saying...
Bob: You're taking over the family business?
Louise: (scoffs) Yeah, right.
Bob: Ha! Admit it, you look up to me.
Louise: No! You are ruining our perfect day right now!
Bob: Oh, my god, am I your hero?
Louise: (groan) Sick!
(at the end of the episode)
Bob: So, when you run the restaurant, will you call it Louise's Burgers?
Louise: I don't know. Maybe. (hugs Bob) Daddy.
"Boyz 4 Now". Louise and Tina have a bonding moment when Louise has her first crush. Louise ends up saying that she thinks Tina is a strong woman because although Tina has crushes all the time (which Louise hates), that Tina can handle herself without freaking out is something she admires.
The Reveal of who was dunking Bob's turkey's in the toilet in "Turkey in a Can". It was an allergy medicine induced sleepwalking in Bob, who was using the Turkey to represent his memories of potty training Tina, representing his subconscious fear of her growing up. Not only is the flashback of Bob helping a two year old Tina sit on the potty heartwarming enough inn itself, but it's then topped by Tina assuring Bob she still needs him and Bob allowing her to sit at the grown-up table.
The first episode has Linda and the kids reassuring Bob that despite all his failures, the fact that he's pursuing his dream of a burger shop makes him better than Hugo who never had a dream at all.
A blink-and-you-miss-it moment, but in Seaplane! as Linda has to land the seaplane by faking a crash the way her instructor did, Gene freaks, grabs his sisters' hands and the three hold on to each other.
In "Presto Tina-o", Jimmy Jr. and Tina making up after their big fight and winning the award for best on-stage chemistry.