We've all been guilty of allowing excess oil or fat end up down the drain.
But the truth is, it has some pretty devastating consequences.
Fats, oils and grease (known as FOG) can build up in our sewers causing mushy mounds which can lead to blockages and even spark flooding.
And in St Andrews a huge blockage, now being dubbed a Fatberg, has been discovered as a result of careless actions.
The disgusting mound brings the total removed from the Fife town to 160 tonnes - the equivalent weight of 28 adult elephants.
It was removed by Scottish Water , who worked with local businesses in a drive to reduce the amount of FOG being put into the sewer network - including fitting grease trapping equipment into their kitchens.
A total of 172 businesses were briefed on the importance of correctly disposing fats, oils and greases in a bid to reduce the harmful waste building up in the sewers.
Mike Will, Waste Water Operations General Manager at Scottish Water, said: “As a result of our time in Fife the sewers will be 160 tonnes lighter of FOG.
"There was no secret to this diet’s success - this weight loss was only possible with the incredible support from the businesses we visited."
He added: “Collectively, businesses spent around £500,000 fitting new or bigger grease trapping equipment. That highlights just how much they care for their community.
“As part of this fat-free drive Scottish Water carried out a major sewer clean in St Andrews. We hope this prevention and cure approach will make for a much healthier and slimmer sewer network and a significant reduction in the number blockages."
Philip Soden, Managing Director of Environmental Compliance and Services (ECAS), added: “Most people simply didn’t realise their own actions could potentially lead to sewer flooding, causing irreparable damage to their own community."
