Maybe the flashpoint in that row with your partner over breakfast was about who could do the Guardian crossword. Or perhaps it all kicked off after you suddenly felt an irrational annoyance over the shape of their ears and decided to torch their crumpets.
But relax - you are probably not alone. One expert on relationships believes today is the day when couples are most likely to row, the Telegraph reports.
Paula Hall, a relationship psychotherapist, thinks there is likely to be a distressing alignment of circumstances making rows more likely to happen today. These include the rainy weather waking everyone up to the fact that summer is over.
Couples who have been cooped up on holiday together could start regarding each other as though they were cellmates and feel the need for a bit of space.
Ms Hall says many people are also hard up after spending a fortune on getting away, and suddenly the inlaws are on the phone demanding confirmation of seating plans for Christmas dinner.
She thinks pressures over sex, work, children and housework could add to the volatile mix and "often manifest themselves in bickering and needless arguments".
And (my personal addition) let's not forget the smouldering hurt over England's World Cup exit - maybe it has all finally sunk in.
A spokeswoman for Divorce Aid tells the paper that the peak time for divorces being initiated is in September, after the August bank holiday, with another peak coming after Christmas. As we keep hearing, the divorce rate continues to rise.
The idea of an optimum day for rowing couples might remind some of the stories earlier this year about claims that January 23 was the most miserable day of the year.
Cliff Arnall, a psychologist at Cardiff University, said a combination of festive debts, freezing weather and post-Christmas blues combined to create gloom, gloom and more gloom. So if you row with your partner today, at least you have January 23 to look forward to.
Do you think Ms Hall is onto something? Did you have a row with your better half today?
