Always amazes me that people don't take any responsibility for their own actions....
Sure its a monumental

up but hey..... how bout checking the boarding display.... or perhaps this might have been a give away....
"Good evening ladies and gentlemen, this Captain Smith up here on the flight deck. On behalf of the crew I'd like to welcome you aboard this Qantas flight Los Angeles to Melbourne. We're just waiting for our push back clearance and once we're under way I'll get back to you with more details regarding flight times."
Los Angeles to Melbourne derr!