It's funny to look back at primary school and try and spot the signs of who the people around you would become.
You can make your own assumptions, but scientists are saying they have isolated a particular trait that means the child tends to earn more money later on in life.
The trait is simple, you know how you're always told you should respect your elders? Well, the children that do the opposite were found to usually earn more money when they grow up.
The study looked 745 sixth graders between 1968 through 2008 in Luxembourg and found kids that had a little testiness in them would go on to make more money than the people who didn't.
It may sound bizarre, but there is actually logic behind this. For example, if you're not afraid to stand up to someone you could potentially do better when it comes to contract negotiations, job searches and day to day life in your line of work.
A tendency to break the rules also surprised the researchers, as it was found that kids who broke more rules actually went on to earn more in later life too.
Another study out of Hawaii in 2006 found that students who's teachers described them as 'unconscientious' or 'rule-breakers' were also more likely to smoke and drink with higher body mass indexes.