Happens more often than you might think... As [[FamiliarFaces CR put it]], because the show wasn't nearly as schmaltzy as shows like ''Series/FullHouse'', the moments where the characters did something heartwarming [[OOCIsSeriousBusiness meant all that much more.]]
* The Indian casino episode.
* While it borders on AuthorTract, Duckman's pep-talk to America at the end of "America the Beautiful" fits.
-->'''Duckman''': There've even been times I've wanted to give up - but if I do, how can I expect things to ever get better? What kind of world would I be leaving my kids?
* "The Girls of Route Canal", in which Duckman tells his sons the story of how he met Beatrice.
* Near the end of "Cellar Beware", Duckman throws himself on top of a bomb -- and even though it didn't end up exploding, Duckman "sacrificing" himself ''willingly'' to protect his family tugs at the heartstrings a little.
* The end of "Sperms of Endearment", when Duckman and Bernice walk together in the park and engage in a venom-free exchange of their usual insults.
* After being driven to the brink by his various future-selves in "The Once and Future Duck", Duckman finds himself face-to-face with a past version of himself -- from the day of his wedding.
--> '''Past!Duckman:''' There are some things I-I gotta know! For instance - my marriage. Am I doing the right thing, marrying Beatrice? Do we grow old together?
--> '''Present!Duckman''': ''({{beat}})'' [[http://youtu.be/1DHb03sY1KY?t=18m16s You're gonna love her until the day you die.]]
--> '''Past!Duckman:''' …maybe I don't need to know any more than that.
* The episode "About Face" has Duckman falling in love with a 911 operator [[ArousedByTheirVoice over the phone]], staying with her and actually being ''honest'' about himself even after finding out that she's TheGrotesque, so hideous that even ''[[TastesLikeDiabetes Fluffy & Uranus]]'' are horrified. She eventually gets plastic surgery because she hates how hurt Duckman looks at others' reactions, and becomes the ''perfect'' woman... [[CruelToBeKind at which point he breaks up with her]], [[IWantMyBelovedToBeHappy realizing that he's completely beneath what she deserves]].
** Even more notable in that ''[[JerkAss Bernice]]'' even empathizes with Duckman's position.
* "Ajax and Ajaxer" ends with a dedication to the late Dana Hill.
** The same episode has Ajax completely heartbroken when [[spoiler:Cornfed starts to get his intelligence back, costing Ajax his only friend.]] Cornfed assures Ajax he'll still be his friend, even if it won't be the same, and takes him to meet his idol Merv Griffin.
* After Duckman reveals why he was such a jerkass to King Chicken as a child, they bond in King Chicken's rec-room/Duckman-murder-shrine. After so many implied years at each other's throats, for the truth to finally come out and for them to be able to be in a room at the same time, even if it involved copious amounts of alcohol and King Chicken having an affair with Bernice, was a nice development.
** [[spoiler:Too bad it didn't stick by the end of the episode, though...]]
* The ending of the ''very first episode'' qualifies as one. Well, two if you count the dedication to the late Frank Zappa, whose son is the voice of Ajax.
* In "Gripes of Wrath", when Duckman is confronted with a cheerful Bernice being nice to him, he breaks out with "[[OtherStockPhrases Who are you]] and what have you done with Bernice?!" And he sounds completely sincere and genuinely angry.
** Later, when Duckman confronts [[ItMakesSenseInContext the supercomputer that has resulted in changing society]], Charles and Mambo suddenly burst in asking for the computer's autograph. The computer responds by threatening Charles and Mambo; Duckman's immediate response is to jump in front of them and yell [[PapaWolf "Stay away from my kids!"]]
* In "The One with Lisa Kudrow in a Small Role" and ends up abducted by aliens. While he sees their planet, the family notices he's missing and gets worried. Duckman and Cornfed look for clues in Ajax's room—finding out instead that Ajax has started himself a college fund, but it's full of IOUs for money he's been slipping ''into'' his father's wallet for Duckmans recreational expenses.
-->Duckman:This must be every allowance he ever got. Didn't he ever spend any money to make himself happy?
-->Cornfed: Apparently this did make him happy.