Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Duckman
Duckman's depression over the death of Beatrice, until the revelation Cut ShortSeries Finale, manages to tug at the heartstrings. A scene that best cements this occurs in "The Once and Future Duck", wherein Duckman is visited by multiple versions of himself from alternate futures. But towards the end, he meets his past self from his wedding day, who asks if he and Beatrice will grow old together. Duckman sadly but truthfully tells his past self that he'll love Beatrice until the day he dies.
"About Face" has Duckman developing a legitimately loving relationship with Angela, who goes from Butterface to Ms. Fanservice in an attempt to improve herself. However, this transformation causes her to get a lot of unwanted attention from admirers and the media. Duckman realizes just how undeserving he is of a wonderful woman like her, especially as she now has potential for a better life. Feeling he is just holding her back, Duckman doesn't meet her for their last date and just lets the phone ring, while visibly depressed over the matter.
"The Girls of Route Canal" explores how Duckman and Beatrice met, hitting it off well, until he discovers she's married to a kindly duck named Richard. Duckman's despondent "I'm...I'm nobody" when he introduces himself to Richard is pretty heart-wrenching in itself.
After he has sex with Bernice to keep himself from dying in "Pig Amok", Cornfed falls for her and is distraught when she doesn't return his feelings. Seeing the usually collected Cornfed break down is pretty sad in itself, but then it gets to the point where he intends to commit suicide by jumping, believing he can't live without her.
"Cock Tales for Four" seems like it'll conclude with Duckman and King Chicken settling their differences once and for all. But after Honey addresses her husband's infidelity and Duckman succumbs to Honey's advances, it devolves into Duckman and King Chicken reinstating their feud. To make it even worse, they had agreed to a temporary ceasefire on behalf of Ajax being in love and starting a relationship with King and Honey's daughter Tammy. But once they've become sworn enemies again, Duckman and Bernice depart with Ajax. He asks if he'll see Tammy again, but receives no answer. As if to hammer it home, the final shot is Ajax staring through the back window with a worried expression as they drive away.
The plot of "With Friends Like These..." is kicked off by Duckman's depressed realization over that, aside from Cornfed, he has no friends, thanks to his crude, Jerkass attitude. He looks towards a group a la Friends and finally seems to fit in. However, his insensitive tendencies crop up even when he's trying his hardest to please his new friends, just so he can belong. Frustrated, they beat and nearly kill him, leaving Duckman alone again, until Cornfed comes to console him.
"Four Weddings Inconceivable" ends with the sudden revelation that Beatrice has been alive this whole time. When Honey asks who she is, Duckman quietly and sadly comments that she's his first wife, so shocked that she's been alive after all this time.