But that's when things turned sour ... Very quickly.
Wanting to wrap things up quickly, he made one final joke while addressing the bridal party. It's safe to say it spectacularly backfired.
"I said: 'Bridesmaids, I am a bit short of time here and I don't really know you all so I'd just like to say that five out of six of you look stunning today ... figure it out amongst yourselves'."
Then the room "went dead".
"I knew I'd really f**ked up," he admitted.
The best man was mortified to find out his joke left one of the bridesmaids in tears.
He explained he "didn't actually mean any of them - it was literally just nonsense", but it wasn't enough to calm the situation down.
His night was over.
"The bride came up to me and just said 'I think it's best you leave' and the groom just nodded behind her. I felt so bad and messaged them all and also apologised on the group Facebook page."
The man's post led to hundreds of comments from others about their horror experiences at weddings, including a wedding photographer who called this speech one of the worst.
"As a wedding photographer, I feel this one. Big time. I have seen some terrible best man speeches in my 400+ weddings, but if I had heard this speech, it would have been my top two or three worst ones ever. That is quite the accomplishment."
Another added some advice going forward: "You can barb the groom, you can barb the groomsmen; but bride and bridesmaids is 100 per cent 'shower with compliments' section of the speech, full stop."