A Scandinavian Airlines (SAS) flight was forced to ground on Wednesday after a rat crawled out of a passenger's food.

The airline said the plane was en route from Oslo, Norway to Malaga, Spain, but was forced to land early in the Danish capital, Copenhagen. said Friday's Guardian.

“Believe it or not, the lady next to me on SAS Plus opened her food and a rat jumped out,” passenger Jarl Borrestad wrote on Facebook on Wednesday. “Now we have turned back and landed at CPH. [Copenhagen Airport] Regarding flight changes.”

SAS spokesman Øystein Schmidt told the Guardian that there was an “aircraft change” when the flight landed in Copenhagen, adding that passengers were then flown to Malaga. (Related article: Plane forced to turn back after maggots fall on passengers: Report)

“This is an extremely rare occurrence,” Schmidt told the outlet. “We have procedures in place for situations like this, including reviews with our suppliers, to ensure it doesn't happen again.”

Aircraft Owners and Pilots Association (AOPA) Notes Rats can chew through an airplane's electrical wiring, causing short circuits and arcing. Such damage can pose a fire hazard.

“When rats take up residence on an airplane, not only does it become a rat home, but, ahem, the toilets too. This isn't just a nuisance; rat urine corrodes metal and their droppings act as an anti-desiccant, retaining moisture which can lead to water corrosion,” AOPA added.

While rats are rare on planes, they're not unheard of: In 2017, a rat was discovered on board a British Airways flight bound for San Francisco, California at London's Heathrow Airport, according to The Guardian. The flight was delayed for four hours before an alternative flight was arranged, according to the paper.