15 wedding guests reveal the moment they knew the couple wouldn't last.

Have you ever been to a wedding and just known that things weren’t exactly going to work out?

Although the couple may be vowing “’til death do us part”, wedding guests can sometimes tell from the get-go that the marriage isn’t going to last in the long haul.

From brides flinching when it’s time to kiss to secret mistresses appearing, there are lots of tell-tale signs.

We spoke to Mamamia readers and scoured Reddit to find the 15 best accounts from wedding guests who knew the couple wouldn’t last.

Here’s what they had to say:

“The groom looked drunk.”

“The bride seemed incredibly angry. There was this woman walking around during the reception placing bets on when they would divorce. I later found out she was the mother of the groom.” – Redditor destinydivided

“The mistress showed up.”

“Grooms mistress found out he was getting married and showed up at the wedding, in the middle of the i-do’s, walked right up on stage and smacked him in the face.” – Redditor jenngraham2012

“The bride was cheating.”

“The bride was sleeping with the best man – as far as well all know, it’s still happening today.”

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“He looked miserable.”

“At the rehearsal dinner, the groom’s mum is in tears, because ‘he looks miserable’ and he was, we all knew it.”

“During the vows they had written for each other, the bride starts with ‘I know I can be a pretty terrible person, and I don’t know why you’ve stuck around, but that’s all going to change starting today!'”

“They divorced a year later.” – Redditor vogelarcher15

Tears at the altar

“He cried at the altar and in his speech said that he thought she was way out of his league… turns out he was right.”

“She flinched.”

“She flinched when he turned to kiss her. They were divorced within six months.” – Redditor unlimitedanna

“Everything about it felt wrong.”

“They never had a stable relationship to start with, everything about it felt wrong. Even some of the groomsmen were reluctant to take part.”

“He got black out drunk.”

“Her husband got black out drunk and they got into an argument. He passed out and she ended up throwing a bucket of ice water in his face to snap him out of it. She was devastated.” – Redditor juicethebrick.

He should have married her instead.

“The mother-in-law called the bride ‘a bar maid’ and introduced the groom’s ex in the speech, saying ‘I was expecting him to marry you, what a shame’.”

Can you wear white to a wedding?

Shotgun wedding

“The ceremony was very short and so awkward. They lasted all of four months and only got married because they had a kid together.”

“She threw a tantrum.”

“The bride threw several tantrums about stupid sh*t, including one in which she accused the groom of stealing her drink.”

“He told her she was a ‘dumb whore’, but it all worked out because she found her drink.”

“The groom pulled the ring off of the Bride’s finger during the reception and swallowed it ‘as a joke’. They eventually did divorce.” – Redditor ColonialChicken

The secret girlfriend

“A woman we didn’t recognise turned up at the reception. Word got out and we soon discovered it was the bride’s secret girlfriend. Marriage over.”

“They constantly fought.”

“They just constantly fought, it was an explosive meeting of opposites, but they still persisted – perhaps out of stubbornness. They are no longer together.”

Caught red-handed

“Groom got caught getting frisky with a bridesmaid. The marriage lasted for about two hours.” – Redditor SunkenLoki

Running late

“I was running late but I didn’t stress because I knew their marriage wouldn’t last. Two years later, she left him.”