Personally, this one:
-The newlyweds had theoretically been together for 5 years but saw each other so little that they were almost strangers to each other.
-The bridegroom discovered only belatedly that the one he was going to marry was a spoiled child submissive to her mother.
-The groom wanted children and the bride said she would think about it, but still hadn't made up her mind on the wedding day.
-Everyone was originally supposed to sleep at a friend's house, who suddenly put the dishes in the big ones, but the mother of the bride decided on a whim that no, her daughter would not sleep in said house, although obviously without notifying the owners.
-3 people (the bride, her mother and a guest) ended up spending the night in the village hall. The mother slept glued to her daughter and the guest had to stay awake all night for lack of a place to lie down.
-During the feast, the guests were of different origins and gathered in homogeneous ethnic groups who stared at one another.
-The DJ only played Senegalese music, which obviously only appealed to guests of Senegalese origin.
-The mother of the bride has a disconcertingly fragile ego, preferring to refuse to answer a question rather than admit that she does not know.
Just thought of a second one. Former best friend now just regular friend. Cheated on everyone they've been with with this dude. Dude has no job, no license, not good looking, leach on society type. Finally their relationships goes south and in comes my friend to rescue him. After a month they announce there engaged, 2 weeks later the wedding.
Wedding is in their apartment living room. Dude proceeds to get trashed and announce to anyone who will listen that he basically is going to use my friend, never planning on getting a license or a job, no goals, just wants to stay home and do nothing for the rest of his life. Keeps calling my friend by their exes name, can't remember the vows, passes out drunk about an hour after the ceremony. Most cringe thing ever.
Friend tells anyone who will listen how happy they are to finally be with "the one that got away." All while their life is going down hill fast.
So not just a bad wedding but a bad relationship. The wedding was so ungodly cringe.