Your wedding day is supposed to be the best day of your life. Everything is supposed to be perfect, the flowers need to be just right, everyone needs to be on their best form - as well as their best behaviour. However, there will always be someone that likes to be an exception to the rule.
It might be that weird uncle of yours who gets pissed and acts really odd with all of your friends. It could be the best man's speech where he uses every stock joke in the book.
Or, perhaps it could be a woman wearing a bikini and having a big old sleep just metres away from your ceremony. Yes, that really could happen - and it did.
I mean, it's everyone's beach and all that, but if you are actually IN the photos and not invited, you're too close.
The wedding in question was taking place on Port Willunga beach in Adelaide, South Australia, and the photos all contain a picture of the stubborn sunbather who has her head down and her arse towards the wedding.
Posted - rather aptly - to an Instagram account called 'Shit Adelaide' the photo has since gone viral, although nobody has managed to track her down just yet.
The original photo is captioned: "That awkward moment when a beach wedding interrupts your sun tanning session..."
It looks pretty unlikely that she was invited, although that would certainly make for a more interesting story.
Some have suggested that perhaps she was - one commenter on the original Instagram post said: "That's just cousin Shazza. She always passes out drunk and half naked at family weddings... although during the ceremony is a new record..."
Others have suggested that she was originally down for a more important role in the wedding. One said: "Maybe that WAS the bride".
True, the bride doesn't appear to have arrived at the wedding yet - so perhaps she was using the fine weather as an opportunity to put the last touches to her pre-wedding tan.
A lot of people sympathised with the wedding party - suggesting that the unknown woman could have moved to another part of the beach and continued her tanning session. But, to be honest, if she was there first, why should she? I mean, outside of the fact that it's the nice thing to do and all that.
It's 2018 guys - nobody cares about doing the nice thing anymore. I now pronounce you man, tan, and wife. Get on with it.