We all have things about our colleagues that get on our nerves - they might eat too loudly, whistle around the office or forget to wear deodorant.
However, none of those unacceptable behaviours top the list of what people find most irritating about their colleagues.
In a survey of over 1,000 workers, more than two thirds said colleagues not doing their job properly was what rubbed them up the wrong way the most.
Other issues included being micro-managed or being given the wrong information, according to the study by Acas.
The workplace conciliation service says the behaviours identified in the survey can have a negative impact on relationships, productivity and potentially lead to disputes.
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Kate Nowicki, director of dispute resolution at Acas, said: "Whether it is lack of clarity or recognition, a personality clash or something else, these bad behaviours may seem relatively minor, but they can have a cumulative and detrimental effect on people at work.
"When a relationship breaks down, it can be difficult or even impossible for a workplace to function.
"This can increase stress, impact productivity and may ultimately lead to bullying or harassment claims.
"If that happens, Acas mediators can help workers find their voice and resolve differences without the cost and stress of more formal procedures such as an employment tribunal."
(c) Sky News 2024: Do you annoy your colleagues? Top workplace frustrations revealed
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