Sisko and Kasidy are getting married. Except now they aren't. And now they are again. Godsdamnit, is this a part of the marriage ritual in the 24th century, or something?
First Keiko did it, then Jadzia, now Sisko. I have it on good authority (i.e. I made it up) that the opening sequence of Nemesis was supposed to be Deana calling off her wedding to Riker because he grew that beard back, but they cut it to add more shots of dune-buggies.
I don't think there has been any
TV show to actually have a wedding where the bride and/or groom doesn't try to back out at the last minute.