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There are two types of people in this world, grumpy people and people who know someone that's a complete grump.
Despite being a bit cranky, there's no denying that we love the grumps in our life for being unapologetically them.
While a lot of people would argue that happier people are more likely to live longer, earn more money and be more successful, that might not be the case.
It is actually grumpy people that tend to succeed more in life, according to science.
That's right, you are more likely to earn more money, live longer and enjoy a healthier marriage.
According to the BBC, grouchy people are more likely to be superior negotiators, decision-makers and cut their risk of having a heart attack. Good moods, however, come with substantial risks and can make you gullible and selfish.
One study found that grumpy people were able to make better decisions and be less gullible.
Joseph Forgas worked with colleagues from the University of New South Wales in Australia to see how mood can impact our daily lives.
To put volunteers in a happy or sad mood he showed them films in the lab.
He then asked them to judge whether urban myths were true, such as if the CIA murdered President Kennedy.
Those in a good mood were less able to think sceptically and were more gullible, whereas those in a bad mood were the opposite.
Forgas said: "Negative moods indicate we're in a new and challenging situation and call for a more attentive, detailed and observant thinking style."
He added: "People who are feeling slightly down pay better attention to external social norms and expectations, and so they act in a fairer and just way towards others.
"Happiness functions like a shorthand signal that we're safe and it's not necessary to pay too much attention to the environment."
According to the BBC, optimism also has negative effects and can lead to less people being successful.
"People feel accomplished, they relax, and they do not invest the necessary effort to actually realise these positive fantasies and daydreams," said Gabriele Oettingen from New York University.
Graduates who may fantasise about finding success at work often end up earning less, and patients who dream about getting better make a slower recovery.
"People say 'dream it and you will get it' - but that's problematic," she added.
Time to get our grump on.
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