On Tuesday, the “mega rat” became the most shared item for popular Swedish daily Aftonbladet, according to a tweet by journalist Sven Nordenstam.
Social media rang with gasps of disbelief, disgust and amusement. “Can’t even read the news because there’s a story about a giant rat on it,” wrote one person. “I’d be moving on out of there,” wrote another.
Laughing incredulously, Mr Korsas told the BBC that one reporter had said he should have frozen the rat’s carcass for posterity. “You do have big rats in London too, yes?” he asked.
Since the incident, the family and its cat – a Cornish Rex by the name of Enok – have not been bothered by rats of any size, Mr Korsas added.
Despite regular media speculation, there appears to be little evidence of rats getting bigger in developed countries.
However, scientists do believe they could eventually grow into the size of sheep, Dr Jan Zalasiewicz, of the University of Leicester in the UK, recently told the BBC.
That said, any significant change would be a long way off.