Anak's parents from Tower of God. Her being wed to a commoner away from the court of King Zahard certainly was a bit of a culture shock for her, so they tended to argue almost everyday. Why did they stick together? Because Aww, Look! They Really Do Love Each Other of course.
Today, Jo Brand does the same thing from a woman's perspective—although she freely admits that jokes aside, her marriage is actually pretty good.
A little boy runs into his parent's room crying that there's a monster under his bed. His father gives him these words of wisdom: "Enjoy it while you can, my son. When you grow up, the monster'll be in your bed!"
"Daddy, why does the bride wear white on her wedding?" "Because it's the happiest day of her life." "Oh... So why does the groom wear black?"
The Lockhorns, though thankfully the eponymous couple apparently doesn't have kids.
For Better or for Worse since going into reprints/new-runs seems to spend a lot of time dwelling on how John is an insensitive dolt and the children have nothing better to do than make Elly's life harder. Perversely, the strip also implies that anyone who doesn't settle down and live the same kind of life is irresponsible, childish and a bad person.
Stanley and Harriet Parker of The Better Half started out like this, but a change of cartoonists in the '80s brought a much more lighthearted tone to their relationship (as well as a rather dramatic Art Evolution).
Tom the Dancing Bug parodies this with "Marital Mirth", which is stylistically modeled after "The Lockhorns". Unlike other examples the thin veneer of jocularity is removed, with every strip featuring the two talking about how much they openly hate each-other.
Films — Live-Action
In The Hangover, Phil, who misses life before marriage and kids, tells Doug that once he gets married, he's going to start dying a little inside every day. He also discourages Stu from marrying his Control Freak girlfriend.
In Old School, Vince Vaughn's character, who is the best man at a wedding, reminds his friend that "you only gets one vagina for the rest of your life" just as he's about to get hitched.
Rick from Bachelor Party gets this several times throughout the movie; his Henpecked Husband older brother tells him that before long, the novelty of marriage wears off and it becomes a chore, and his friend Brad, who just went through a heart-wrenching divorce, tells him that "as soon as you get married, everything changes."
Wayne's World: "Garth, marriage is punishment for shoplifting in some countries."
Being forced to marry the foolish, irresponsible Lydia is essentially Wickham's punishment in Pride and Prejudice. It is also implied that, although she loves him now, marriage to Wickham will one day be this to Lydia as well. Many other couples in Jane Austen's works exemplify this as well, sometimes softened with moments of Aww, Look! They Really Do Love Each Other. Justified in that divorce was not really an option in Regency England
And Everybody Loves Raymond, which increased over the years, though Ray and Debra weren't nearly as bad as Ray's parents.
Same with Reba, although they spent more time dancing around it.
Reba holds bitter feelings toward Brock and "other woman" Barbara Jean for the collapse of their marriage, despite constantly putting down Brock for other things and generally saying how the last few years of their marriage were miserable anyway before Barbara Jean entered the picture.
Similarly, the last couple of seasons showed Brock and Barbara Jean entering this, constantly bickering and fighting, separating at one point, and teetering on the brink of divorce several times.
Finally, back in the first season, Brock meets Barbara Jean's father, who acts morally superior to Brock since he has been married for over 50 years and would never divorce his wife... "mostly because she's too ugly to kiss goodbye." Reba showed that, while this is becoming a Dead Horse Trope in a lot of ways, in some conservative and religious communities (the show took place in Texas), a bad marriage is still preferable to a divorce, especially amongst the older generations.
Til Death is somewhat of a deconstruction in that the better you know Joy, the slobbier she seems, and the better a match for Eddie.
Frasier: Niles and Maris, off-screen, though they eventually got divorced. He had a habit of choosing women who treated him badly.
A married couple were recurring characters (Joseph and Mary) in Father Ted where the gag was they loathed each other; with the husband verbally abusing the wife and the wife constantly beating the husband until Ted appears. At which point they they would switch and become lovey-dovey towards each other. The joke works because the island is predominantly Catholic, were divorce is still highly frowned upon.
Revenge has Victoria and Conrad. Not funny at all.
The Bickersons - who, with 1949 origins, may be the Ur Example, at least for the Sitcom.
On Cabin Pressure, Mr. and Mrs. Birling openly hate each other, which is part of the reason Mr. Birling pays the protagonists to fly him far away from her.