Lesson learned: Do not get into business with your spouse.

You know your relationship is bad when it's actually destroying your business. That's exactly what happened in the case of Kata and Marcelo, a couple featured on popular chef Gordon Ramsay's series Kitchen Nightmares. The two were happy once upon a time, happy enough to think that going into a business relationship together was be a stellar idea.

Worst. Idea. Ever.

Not only did they clash over every little thing, but their restaurant began suffering because of their fighting and they ultimately separated over it. They stil co-run the restaurant, though, and therein lies the proble: Even though they've broken up, for as long as their restaurant is open they'll always be linked. Had they decided to take on separate business opportunities, they could still be together. Kata and Marcelo had to learn this the hard way. It sucks, but fortunately for us at least it made for good TV.