Wedding photographers - always watching

A lot goes on during a wedding, and it's easy to get caught up in the celebration as guest and miss some of people's more nuanced behaviours during the day.
Well, this has peaked the interest of users on Reddit, with one person asking the wedding photographers of the site:
"Have you developed a sixth sense for which marriages will flourish and which will not? What are the green and red flags?"
Spoiler alert. They have.
A photographer is in an almost unique position, an impartial observer who's job is to step back, watch what's going on, and capture the best moments.
The first red flag that came up? Shoving cake in your partners face.
One photographer said: "I swear that all of the couples that have split up have smashed the cake in their SOs face. None of the nice cake couples have. Just my weird anecdotal experience. Maybe it’s a sign of respect for each other."
Another agreed:
"Sometimes one of them (usually the groom) will force cake all over the others face and embarrass and upset them. I've seen this happen a handful of times and all of those relationships that I have kept up with have ended in a divorce."
Now, maybe your relationship is different, and both parties would be entertained by the cake smash - but in this case "if in doubt, leave it out" is a good policy.
Elsewhere - a quiet bride is considered a major red flag, with some suggesting it's a telltale sign of an unhappy relationship.
Another one you jivers will have to watch out for is country music as a first dance. No idea how photographers have noticed a correlation there - but beware!
Also replying to this thread was a photographer who said the groom winked at both them and their and assistant during the wedding.
"He was not winking in the sense that he might have been tearing up or had something in his eye but there was a part in the ceremony where the couple sat down and he would lean his head back in his chair look past his soon to be wife and wink at me or look over his left shoulder and wink at my assistant. It was bizarre."