Tame compared to the others but:
The best man needed a trip to A&E on the morning of the wedding - luckily only for a small injury and they did make it in time for the wedding.
Best man's +1 was drunk as a skunk before she even turned up. She was lovely and no trouble but guests kept mentioning her drunken-ness to the bride in a very looking down on her way. I mean, it's a party right? She just had a head start on everyone
she wasn't loud or inappropriate, just a bit stumbly and slurry but very good natured and polite. I was impressed she managed to stay upright the entire time especially in heels!
Other groomsman's partner took serious offense to him sitting at top table next to MOH, caused a bit of a ruction and he was not allowed to be anywhere near MOH after wedding breakfast. She also made him leave early. Bride and groom both pretty pissed off with her but separately decided just to ignore her. MOH was not interested in groomsman, she was just chatting to the person sitting next to her!
One of the bridesmaids had put on weight suddenly (not pregnancy related) and it was touch and go whether the dress would close - bless her she breathed in and soldiered on!
The brides mum used her newly bought for the wedding perfume to wear without asking. She had her own, just wanted the brides - coz every H to be wants his bride and MOB smelling exactly the same, olfactory sense is a massive memory trigger and bride had thought any time in future she wore it, it would bring back memories of the wedding... not the MOB 
At the wedding breakfast the bride felt very ill suddenly and dashed off twice to be sick, the groom knew and didn't bother to check on her or ask if she was ok when she reappeared.
Then at the reception the groom kept disappearing and all the guest kept asking the bride where he was when she was going round trying to talk to everyone. Was quite sad, she put the best face on she could but groom spent most of the night in the car park with his groomsmen clearly avoiding everything else 
During the first dance the groom stood stock still and resisted all efforts by the bride to even move his feet a little bit - he could dance, just refused to even sway.
The guests noticed the grooms odd behaviour all night and were a bit
no one said anything to bride till a long time afterwards.
Groom later grumped at bride because she didn't want to have sex in their ground floor bridal suite because the curtains hadn't been pulled shut properly and she didn't want to be seen by anyone who walked past.
As an added extra bonus on the honeymoon the groom persisted in telling people that asked that they were just on holiday.
Yes I was the bride. Yes I left him about a year later because it just got worse from there. He clearly hadn't wanted to get married but waited until after it was done to show his displeasure because he was a passive aggressive twat 