They usually strive to please passengers.
But a team of AirAsia cabin crew decided to ditch their professionalism in favour of a bizarre plane prank, instead.
Footage shows staff taking part in a strange 'moaning' competition over the commercial craft's PA system, while bemused travellers look on, reports Daily Mail.
The exercise, which took place as the plane flew over the South China Sea, appears to have involved the crew and willing passengers trying to moan into the PA system for as long as they possibly can, until their breath runs out, with prizes awarded for the loudest, longest moan.
At one point a staff member announces that someone managed to emit an 80-second moan, which she appears to find rather amusing.