Didn’t karens wedding happen but then they decided to divorce that same day? I might be remembering it wrong.
You left out the best one - Rebecca leaving Robin Colcord:
“Shall I compare thee to a summer’s day? Thou art more lovely and more temperate: Rough winds do shake the darling buds of May, And summer’s lease hath all too short a stay: Sometime too hot the eye of heaven doth shines, And often is his gold complexion dimm’d; And every fair from fair sometime declines, By chance or nature’s changing course untrimm’d; But thy eternal summer shall not fade Nor lose possession of that fair thou owest; Nor shall Death brag thou wander’st in his shade, When in eternal lines to time thou owest: As long as men can breathe or eyes can see, So long lives this and this gives life to thee.”
“I only loved you for your money!”
This happens so often, that when I see a Wedding about to happen on TV, I assume that is what will occur.
I have never heard of anyone really objecting (played for a joke once), or a wedding where either called it off at the wedding. I do know of one wedding where the groom got cold feet and never showed up. Kinda anticlimatic.
Not that he actually HAS any power to officiate weddings, but really…he couldn’t say “Do you? Do You? Bythepowervestedinmeinowpronounceyouhusbandandwife.”
You left out “Proceed with the execution!” 
In the BtVS episode Hell’s Bells The two participants have everyone at the Church but Xander couldn’t go through with it. The ceremony didn’t start but everyone dressed and ready to go should be close enough…
-DF
Actually, Diane may win this thread . She left Frasier standing at the altar AND walked out on her wedding to Sam.
On Hill Street Blues Sgt. Esterhaus walked out of his wedding to his young fiancee when his middle-aged girlfriend showed up at the church.
On the first season of** ER** Carol Hathaway’s fiancee walked out on their wedding. Since everyone was already gathered, she decided to throw a hell of a party.
Tv series 4400 from 2004 or 2005, ran 4 seasons. Shawn and isabelle didn’t end up getting married.
Uhm, no. Sam was the one who broke it off at the very last moment because he didn’t want to stand in the way of Diane’s writing career.
The final scene went something like this:
“Goodbye, Diane. Have a nice life!”
“That’s what you say to someone you’re never going to see again. I’ll be back in six months, after I’ve finished writing my novel.”
“Right. [Long pause] Have a nice life!”
Why not? It was a fine tradition that Starfleet obviously had decided to revive.
The ship had no chaplain. What else could they do for a couple who wanted to get married while on a deep-space mission?
Judy Benjamin (Private Benjamin) walked out of her wedding after sucker punching the groom!
That was the final scene. The wedding itself was a little more complicated.
Start here at about the 21:00 minute mark after Diane’s publisher has called with the news about her manuscript.
She’s obviously distracted. Sam stops the ceremony and tells Diane she should work on the book.
Diane says no, and tells the justice of the peace to continue.
Sam stops the ceremony again and tells her writing may be the one thing she’s good at. They discuss it and Sam asks her if she agrees that postponing the wedding would be the best thing.
Diane says “I do” and the wedding is over.
So it may be a little hyperbolic of me to say Diane “walked out” but the way I see it, she was the one who made the final break.
And even if it doesn’t matter in the long run, it’s worth watching the wedding scene just for the reactions of the gang.
Diane also interrupted Frasier’s wedding to Candi (with an “i” like Ghandi, so people would take her seriously), but in the subsequent argument in Sam’s office the couple called it off.
Actually, when the minister said, “does anyone…” Diane answered, “I do,” to which Frasier replied, “Right answer, wrong ceremony.”
Glee had a couple in the “well, technically the ceremony hadn’t started yet” category; Will and Emma (everybody is in the church, but Emma runs out and, IIRC, catches a taxi, all while singing “(Not) Getting Married Today” (from Company); also, Finn and Rachel were just about to start their ceremony, but they were waiting for Quinn to arrive when she got into a car accident while answering a text.
And he got off lucky, compared to her first husband!
Hmm, can any of the Legal Eagles here tell us if the people paying for the wedding (usually the brides parents, but it depends) can sue the other party if they change their mind at the last moment?
The bit of bets changing hands had me in stitches the first time I watched it! It was almost as good as the moment in the first season finale when Sam swung the office door open and everybody was there, listening to the argument he and Diane were having.
He probably has the same power to officiate at a wedding as a Justice of the Peace, Judge, Notary Public (in some jurisdicitons). It’s a civil ceremony.
Every movie version of Great Expectations makes reference to a character who was left at the altar.
The intro to that episode where Aunt Bea almost leaves has the wedding scene for Andy’s former housekeeper. A lot of the intros and tags were trimmed in re-runs to make room for more commercials.
There was the called off “arranged marriage” between Opie and Charlene Darling’s baby. They had Opie write with disappearing ink to make them think the match was jinxed.