Whether it was intentionally planned awfulness, or simply an unfortunate happening. Truth is stranger (and funnier) than fiction and I thought we might get some laffs telling stories. If there's already a thread for this, feel free to slap my sorry noob ass around, and I'll post there instead!
Tight, slinky, low-back (all the way down to the waist) bridesmaid dresses when half the bridesmaids were the bride's teen and preteen sisters.
At another one, the DJ played the first dance, mom/groom dance, and dad/bride dance, invited everyone onto the floor during the last of those... and then the next song he played was "Careless Whisper." ... and THEN about half the guests stayed on the floor dancing to it.
And I'm from the South, so I've seen a lot of altar calls (officiants actually proselytizing during the ceremony -- telling the guests that now's the time to come to [religion] and telling them how).