When it comes to a wedding, most people will be aware that only the bride should be wearing white on the big day.
But while guests should try and make sure their outfits are appropriate for the occasion, there aren't really that many other unwritten wedding rules they have to follow.
However, one groom-to-be has turned the tables on his guests, telling them specifically what they shouldn't wear and how they should behave.
And it seems like it's going to be pretty hard for people to meet his ridiculous standards.
Taking to Reddit, a user has shared a screenshot of a Facebook post about an upcoming wedding.
The post, written by the groom, contains important instructions for his nuptials.
These instructions - which could more accurately be described as demands - inform women attending the event that they cannot wear certain types of shoes or dresses, so that the bride will look the best.
It reads: "Attention everyone who will be attending Sharon and my wedding.
"Girls, rules are this. You all cannot wear high heels, or pretty dresses. I told Sharon she will stand out and be taller.
"I want it where every picture has her in the back. In fact, that's another rule, no pictures unless she's in it."
The post then goes on to say that everyone has to give the bride snacks to eat throughout the day.
People on the site were appalled by the man's demands and quickly branded him a 'groomzilla'.
One said: "B**** I will wear whatever I feel like wearing, you control freaks can kiss my a**."
Another commented: "Are they supposed to wear ugly dresses?"
A third joked instead of a dress, they'd turn up in "a tuxedo and top hat" just to "spite" the groom.
Others suggested the guests wear their pyjamas or jeans and a t-shirt to the ceremony.
