I went to one where the couple had met in a way that was a little bit interesting and flattering for the bride, she had joined a sports club where there were no women, been asked out by loads of the team and Groom was essentially her second choice when her first choice moved away (I've changed the details slightly, don't worry). It just wasn't a hugely nice story for the groom.
The night before we played a game with a quiz about the couple and we were all told how they met. During the ceremony which they helped write together, the whole story was told except the second choice bit (just "wasn't he lucky nabbing such a popular woman"). Then the speeches, first FOB spends his whole speech repeating the story - then the groom, who at least had a heads up about the ceremony and should have known better, tells it all again. Finally the best man gets up and tells us it all again, some bits word for word, even pausing for laughs. None of them told any other story or made a self deprecating comment that we might know this story or any reference at all to each other.
Now I could handle this a just one of these things, how unlucky, if the bride, groom and best man didn't spend the next few hours fishing for compliments on how great their speeches were and telling people how working in sales makes them such naturals at giving speeches. It was so weird, I felt like I was grading student presentations where loads of them have been given the same topic, but you know nothing too awful.
The cringey bit though was the dinner party where we had to watch the video of the speeches a few months later and still we were expected to laugh and act surprised at how they met, the groom looking at us expectantly and saying things like "that was a good bit, wasn't it?" "I think I used a really clever pause there."