This would be scary, as Quantas flights tend to be very long and over water most of the trip. They also have the best safety record in the industry, having never had a fatality in their history. So when they have engine trouble during a flight, it makes news.

Hundreds of Qantas passengers have been left stranded at Sydney Airport after their flight to Los Angeles was turned around due to engine problems.
Qantas Flight 249 took off around 3:00pm AEDT.
However, it was forced to return to the airport a short time later after the pilot noticed a noise that indicated problems with one of the engines.
The plane landed safely and no-one was injured.
Qantas says the 316 passengers who were on board will leave on a new plane later tonight. via ABC News Online.