Argue in front of your kids? You are a bad bad person. Well, actually, you're human. And you suck. But really, some of the fighting (or "rowing" as the Brits say) might be helpful from the "this is how real people live, Junior" department, only if you don't get out of hand. Chair-throwing anyone?
A study in Wales finds that children often blame themselves for parental fighting and as a result kids frequently experience failing grades and exhibit other stress indicators when they are unsure about causes of parental conflict. Not surprisingly, the less parents communicate effectively with one another and their children, the higher the kids' anxiety.
Lesson learned. If you want your child to do well in school, at least have the decency to shut the bedroom door before you get your yell on.